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/*************************************************************************************
Extended WPF Toolkit
Copyright (C) 2007-2013 Xceed Software Inc.
This program is provided to you under the terms of the Microsoft Public
License (Ms-PL) as published at http://wpftoolkit.codeplex.com/license
For more features, controls, and fast professional support,
pick up the Plus Edition at http://xceed.com/wpf_toolkit
Stay informed: follow @datagrid on Twitter or Like http://facebook.com/datagrids
***********************************************************************************/
using System;
using System.ComponentModel;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Input;
using Xceed.Wpf.Toolkit.Primitives;
using System.Windows.Media;
using Xceed.Wpf.Toolkit.Core.Utilities;
namespace Xceed.Wpf.Toolkit
{
[TemplatePart( Name = PART_DropDownButton, Type = typeof( ToggleButton ) )]
[TemplatePart( Name = PART_ContentPresenter, Type = typeof( ContentPresenter ) )]
[TemplatePart( Name = PART_Popup, Type = typeof( Popup ) )]
public class DropDownButton : ContentControl, ICommandSource
{
private const string PART_DropDownButton = "PART_DropDownButton";
private const string PART_ContentPresenter = "PART_ContentPresenter";
private const string PART_Popup = "PART_Popup";
#region Members
private ContentPresenter _contentPresenter;
private Popup _popup;
#endregion
#region Constructors
static DropDownButton()
{
DefaultStyleKeyProperty.OverrideMetadata( typeof( DropDownButton ), new FrameworkPropertyMetadata( typeof( DropDownButton ) ) );
}
public DropDownButton()
{
Keyboard.AddKeyDownHandler( this, OnKeyDown );
Mouse.AddPreviewMouseDownOutsideCapturedElementHandler( this, OnMouseDownOutsideCapturedElement );
}
#endregion //Constructors
#region Properties
private System.Windows.Controls.Primitives.ButtonBase _button;
protected System.Windows.Controls.Primitives.ButtonBase Button
{
get
{
return _button;
}
set
{
if( _button != null )
_button.Click -= DropDownButton_Click;
_button = value;
if( _button != null )
_button.Click += DropDownButton_Click;
}
}
#region DropDownContent
public static readonly DependencyProperty DropDownContentProperty = DependencyProperty.Register( "DropDownContent", typeof( object ), typeof( DropDownButton ), new UIPropertyMetadata( null, OnDropDownContentChanged ) );
public object DropDownContent
{
get
{
return ( object )GetValue( DropDownContentProperty );
}
set
{
SetValue( DropDownContentProperty, value );
}
}
private static void OnDropDownContentChanged( DependencyObject o, DependencyPropertyChangedEventArgs e )
{
DropDownButton dropDownButton = o as DropDownButton;
if( dropDownButton != null )
dropDownButton.OnDropDownContentChanged( ( object )e.OldValue, ( object )e.NewValue );
}
protected virtual void OnDropDownContentChanged( object oldValue, object newValue )
{
// TODO: Add your property changed side-effects. Descendants can override as well.
}
#endregion //DropDownContent
#region DropDownPosition
public static readonly DependencyProperty DropDownPositionProperty = DependencyProperty.Register( "DropDownPosition", typeof( PlacementMode )
, typeof( DropDownButton ), new UIPropertyMetadata( PlacementMode.Bottom ) );
public PlacementMode DropDownPosition
{
get
{
return (PlacementMode)GetValue( DropDownPositionProperty );
}
set
{
SetValue( DropDownPositionProperty, value );
}
}
#endregion
#region IsOpen
public static readonly DependencyProperty IsOpenProperty = DependencyProperty.Register( "IsOpen", typeof( bool ), typeof( DropDownButton ), new UIPropertyMetadata( false, OnIsOpenChanged ) );
public bool IsOpen
{
get
{
return ( bool )GetValue( IsOpenProperty );
}
set
{
SetValue( IsOpenProperty, value );
}
}
private static void OnIsOpenChanged( DependencyObject o, DependencyPropertyChangedEventArgs e )
{
DropDownButton dropDownButton = o as DropDownButton;
if( dropDownButton != null )
dropDownButton.OnIsOpenChanged( ( bool )e.OldValue, ( bool )e.NewValue );
}
protected virtual void OnIsOpenChanged( bool oldValue, bool newValue )
{
if( newValue )
RaiseRoutedEvent( DropDownButton.OpenedEvent );
else
RaiseRoutedEvent( DropDownButton.ClosedEvent );
}
#endregion //IsOpen
#region MaxDropDownHeight
public static readonly DependencyProperty MaxDropDownHeightProperty = DependencyProperty.Register( "MaxDropDownHeight", typeof( double )
, typeof( DropDownButton ), new UIPropertyMetadata( SystemParameters.PrimaryScreenHeight / 2.0, OnMaxDropDownHeightChanged ) );
public double MaxDropDownHeight
{
get
{
return (double)GetValue( MaxDropDownHeightProperty );
}
set
{
SetValue( MaxDropDownHeightProperty, value );
}
}
private static void OnMaxDropDownHeightChanged( DependencyObject o, DependencyPropertyChangedEventArgs e )
{
var dropDownButton = o as DropDownButton;
if( dropDownButton != null )
dropDownButton.OnMaxDropDownHeightChanged( (double)e.OldValue, (double)e.NewValue );
}
protected virtual void OnMaxDropDownHeightChanged( double oldValue, double newValue )
{
// TODO: Add your property changed side-effects. Descendants can override as well.
}
#endregion
#endregion //Properties
#region Base Class Overrides
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
this.Button = this.GetTemplateChild( PART_DropDownButton ) as ToggleButton;
_contentPresenter = GetTemplateChild( PART_ContentPresenter ) as ContentPresenter;
if( _popup != null )
_popup.Opened -= Popup_Opened;
_popup = GetTemplateChild( PART_Popup ) as Popup;
if( _popup != null )
_popup.Opened += Popup_Opened;
}
protected override void OnIsKeyboardFocusWithinChanged( DependencyPropertyChangedEventArgs e )
{
base.OnIsKeyboardFocusWithinChanged( e );
if( !( bool )e.NewValue )
{
this.CloseDropDown( false );
}
}
protected override void OnGotFocus( RoutedEventArgs e )
{
base.OnGotFocus( e );
if( this.Button != null )
{
this.Button.Focus();
}
}
#endregion //Base Class Overrides
#region Events
public static readonly RoutedEvent ClickEvent = EventManager.RegisterRoutedEvent( "Click", RoutingStrategy.Bubble, typeof( RoutedEventHandler ), typeof( DropDownButton ) );
public event RoutedEventHandler Click
{
add
{
AddHandler( ClickEvent, value );
}
remove
{
RemoveHandler( ClickEvent, value );
}
}
public static readonly RoutedEvent OpenedEvent = EventManager.RegisterRoutedEvent( "Opened", RoutingStrategy.Bubble, typeof( RoutedEventHandler ), typeof( DropDownButton ) );
public event RoutedEventHandler Opened
{
add
{
AddHandler( OpenedEvent, value );
}
remove
{
RemoveHandler( OpenedEvent, value );
}
}
public static readonly RoutedEvent ClosedEvent = EventManager.RegisterRoutedEvent( "Closed", RoutingStrategy.Bubble, typeof( RoutedEventHandler ), typeof( DropDownButton ) );
public event RoutedEventHandler Closed
{
add
{
AddHandler( ClosedEvent, value );
}
remove
{
RemoveHandler( ClosedEvent, value );
}
}
#endregion //Events
#region Event Handlers
private void OnKeyDown( object sender, KeyEventArgs e )
{
if( !IsOpen )
{
if( KeyboardUtilities.IsKeyModifyingPopupState( e ) )
{
IsOpen = true;
// ContentPresenter items will get focus in Popup_Opened().
e.Handled = true;
}
}
else
{
if( KeyboardUtilities.IsKeyModifyingPopupState( e ) )
{
CloseDropDown( true );
e.Handled = true;
}
else if( e.Key == Key.Escape )
{
CloseDropDown( true );
e.Handled = true;
}
}
}
private void OnMouseDownOutsideCapturedElement( object sender, MouseButtonEventArgs e )
{
CloseDropDown( true );
}
private void DropDownButton_Click( object sender, RoutedEventArgs e )
{
OnClick();
}
void CanExecuteChanged( object sender, EventArgs e )
{
CanExecuteChanged();
}
private void Popup_Opened( object sender, EventArgs e )
{
// Set the focus on the content of the ContentPresenter.
if( _contentPresenter != null )
{
_contentPresenter.MoveFocus(new TraversalRequest(FocusNavigationDirection.First));
}
}
#endregion //Event Handlers
#region Methods
private void CanExecuteChanged()
{
if( Command != null )
{
RoutedCommand command = Command as RoutedCommand;
// If a RoutedCommand.
if( command != null )
IsEnabled = command.CanExecute( CommandParameter, CommandTarget ) ? true : false;
// If a not RoutedCommand.
else
IsEnabled = Command.CanExecute( CommandParameter ) ? true : false;
}
}
/// <summary>
/// Closes the drop down.
/// </summary>
private void CloseDropDown( bool isFocusOnButton )
{
if( IsOpen )
{
IsOpen = false;
}
ReleaseMouseCapture();
if( isFocusOnButton && (this.Button != null) )
{
Button.Focus();
}
}
protected virtual void OnClick()
{
RaiseRoutedEvent( DropDownButton.ClickEvent );
RaiseCommand();
}
/// <summary>
/// Raises routed events.
/// </summary>
private void RaiseRoutedEvent( RoutedEvent routedEvent )
{
RoutedEventArgs args = new RoutedEventArgs( routedEvent, this );
RaiseEvent( args );
}
/// <summary>
/// Raises the command's Execute event.
/// </summary>
private void RaiseCommand()
{
if( Command != null )
{
RoutedCommand routedCommand = Command as RoutedCommand;
if( routedCommand == null )
( ( ICommand )Command ).Execute( CommandParameter );
else
routedCommand.Execute( CommandParameter, CommandTarget );
}
}
/// <summary>
/// Unhooks a command from the Command property.
/// </summary>
/// <param name="oldCommand">The old command.</param>
/// <param name="newCommand">The new command.</param>
private void UnhookCommand( ICommand oldCommand, ICommand newCommand )
{
EventHandler handler = CanExecuteChanged;
oldCommand.CanExecuteChanged -= handler;
}
/// <summary>
/// Hooks up a command to the CanExecuteChnaged event handler.
/// </summary>
/// <param name="oldCommand">The old command.</param>
/// <param name="newCommand">The new command.</param>
private void HookUpCommand( ICommand oldCommand, ICommand newCommand )
{
EventHandler handler = new EventHandler( CanExecuteChanged );
canExecuteChangedHandler = handler;
if( newCommand != null )
newCommand.CanExecuteChanged += canExecuteChangedHandler;
}
#endregion //Methods
#region ICommandSource Members
// Keeps a copy of the CanExecuteChnaged handler so it doesn't get garbage collected.
private EventHandler canExecuteChangedHandler;
#region Command
public static readonly DependencyProperty CommandProperty = DependencyProperty.Register( "Command", typeof( ICommand ), typeof( DropDownButton ), new PropertyMetadata( ( ICommand )null, OnCommandChanged ) );
[TypeConverter( typeof( CommandConverter ) )]
public ICommand Command
{
get
{
return ( ICommand )GetValue( CommandProperty );
}
set
{
SetValue( CommandProperty, value );
}
}
private static void OnCommandChanged( DependencyObject d, DependencyPropertyChangedEventArgs e )
{
DropDownButton dropDownButton = d as DropDownButton;
if( dropDownButton != null )
dropDownButton.OnCommandChanged( ( ICommand )e.OldValue, ( ICommand )e.NewValue );
}
protected virtual void OnCommandChanged( ICommand oldValue, ICommand newValue )
{
// If old command is not null, then we need to remove the handlers.
if( oldValue != null )
UnhookCommand( oldValue, newValue );
HookUpCommand( oldValue, newValue );
CanExecuteChanged(); //may need to call this when changing the command parameter or target.
}
#endregion //Command
public static readonly DependencyProperty CommandParameterProperty = DependencyProperty.Register( "CommandParameter", typeof( object ), typeof( DropDownButton ), new PropertyMetadata( null ) );
public object CommandParameter
{
get
{
return GetValue( CommandParameterProperty );
}
set
{
SetValue( CommandParameterProperty, value );
}
}
public static readonly DependencyProperty CommandTargetProperty = DependencyProperty.Register( "CommandTarget", typeof( IInputElement ), typeof( DropDownButton ), new PropertyMetadata( null ) );
public IInputElement CommandTarget
{
get
{
return ( IInputElement )GetValue( CommandTargetProperty );
}
set
{
SetValue( CommandTargetProperty, value );
}
}
#endregion //ICommandSource Members
}
}

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<!--***********************************************************************************
Extended WPF Toolkit
Copyright (C) 2007-2013 Xceed Software Inc.
This program is provided to you under the terms of the Microsoft Public
License (Ms-PL) as published at http://wpftoolkit.codeplex.com/license
For more features, controls, and fast professional support,
pick up the Plus Edition at http://xceed.com/wpf_toolkit
Stay informed: follow @datagrid on Twitter or Like http://facebook.com/datagrids
**********************************************************************************-->
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:chrome="clr-namespace:Xceed.Wpf.Toolkit.Chromes"
xmlns:conv="clr-namespace:Xceed.Wpf.Toolkit.Core.Converters"
xmlns:themes="clr-namespace:Xceed.Wpf.Toolkit.Themes"
xmlns:local="clr-namespace:Xceed.Wpf.Toolkit"
xmlns:sys="clr-namespace:System;assembly=mscorlib">
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="../../Themes/Aero2/Common.xaml" />
<ResourceDictionary Source="../../Themes/Aero2/Glyphs.xaml" />
</ResourceDictionary.MergedDictionaries>
<conv:InverseBoolConverter x:Key="InverseBoolConverter" />
<!-- =============================================================================== -->
<!-- DropDownButton -->
<!-- =============================================================================== -->
<Style TargetType="{x:Type local:DropDownButton}">
<Setter Property="BorderThickness"
Value="1" />
<Setter Property="IsTabStop"
Value="False" />
<Setter Property="HorizontalContentAlignment"
Value="Center" />
<Setter Property="VerticalContentAlignment"
Value="Center" />
<Setter Property="Background"
Value="{DynamicResource {x:Static themes:ResourceKeys.ButtonNormalBackgroundKey}}" />
<Setter Property="BorderBrush"
Value="{DynamicResource {x:Static themes:ResourceKeys.ButtonNormalOuterBorderKey}}" />
<Setter Property="Padding"
Value="3" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:DropDownButton}">
<Grid x:Name="MainGrid"
SnapsToDevicePixels="True">
<ToggleButton x:Name="PART_DropDownButton"
Grid.Column="1"
IsChecked="{Binding IsOpen, RelativeSource={RelativeSource TemplatedParent}, Mode=TwoWay}"
IsHitTestVisible="{Binding IsOpen, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource InverseBoolConverter}}">
<ToggleButton.Template>
<ControlTemplate TargetType="ToggleButton">
<ContentPresenter />
</ControlTemplate>
</ToggleButton.Template>
<Grid>
<chrome:ButtonChrome x:Name="ToggleButtonChrome"
Background="{TemplateBinding Background}"
Foreground="{TemplateBinding Foreground}"
BorderThickness="{TemplateBinding BorderThickness}"
BorderBrush="{TemplateBinding BorderBrush}"
RenderChecked="{TemplateBinding IsOpen}"
RenderEnabled="{TemplateBinding IsEnabled}"
RenderMouseOver="{Binding IsMouseOver, ElementName=PART_DropDownButton}"
RenderPressed="{Binding IsPressed, ElementName=PART_DropDownButton}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<ContentPresenter Margin="{TemplateBinding Padding}"
Content="{TemplateBinding Content}"
ContentTemplate="{TemplateBinding ContentTemplate}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
RecognizesAccessKey="true" />
<Grid x:Name="arrowGlyph"
IsHitTestVisible="False"
Margin="4,3,4,3"
Grid.Column="1">
<Path x:Name="Arrow"
Width="9"
Height="5"
Data="{StaticResource DownArrowGeometry}"
Fill="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"
Margin="0,1,0,0"/>
</Grid>
</Grid>
</chrome:ButtonChrome>
</Grid>
</ToggleButton>
<Popup x:Name="PART_Popup"
HorizontalOffset="1"
VerticalOffset="1"
AllowsTransparency="True"
StaysOpen="False"
Placement="{TemplateBinding DropDownPosition}"
Focusable="False"
IsOpen="{Binding IsChecked, ElementName=PART_DropDownButton}"
ToolTip="{x:Static sys:String.Empty}">
<Popup.Resources>
<Style TargetType="ToolTip">
<Style.Triggers>
<Trigger Property="Content"
Value="{x:Static sys:String.Empty}">
<Setter Property="Visibility"
Value="Collapsed" />
</Trigger>
</Style.Triggers>
</Style>
</Popup.Resources>
<Border BorderThickness="1"
Background="{StaticResource PanelBackgroundBrush}"
BorderBrush="{StaticResource PopupDarkBorderBrush}"
MaxHeight="{TemplateBinding MaxDropDownHeight}">
<ScrollViewer x:Name="DropDownScrollViewer"
VerticalScrollBarVisibility="Auto">
<ContentPresenter x:Name="PART_ContentPresenter"
Content="{TemplateBinding DropDownContent}" />
</ScrollViewer>
</Border>
</Popup>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled"
Value="False">
<Setter Property="Fill"
TargetName="Arrow"
Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}" />
<Setter TargetName="ToggleButtonChrome"
Property="Foreground"
Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>

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<!--***********************************************************************************
Extended WPF Toolkit
Copyright (C) 2007-2013 Xceed Software Inc.
This program is provided to you under the terms of the Microsoft Public
License (Ms-PL) as published at http://wpftoolkit.codeplex.com/license
For more features, controls, and fast professional support,
pick up the Plus Edition at http://xceed.com/wpf_toolkit
Stay informed: follow @datagrid on Twitter or Like http://facebook.com/datagrids
**********************************************************************************-->
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:chrome="clr-namespace:Xceed.Wpf.Toolkit.Chromes"
xmlns:conv="clr-namespace:Xceed.Wpf.Toolkit.Core.Converters"
xmlns:themes="clr-namespace:Xceed.Wpf.Toolkit.Themes"
xmlns:local="clr-namespace:Xceed.Wpf.Toolkit"
xmlns:sys="clr-namespace:System;assembly=mscorlib">
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="..\..\Themes\Generic\Glyphs.xaml" />
</ResourceDictionary.MergedDictionaries>
<conv:InverseBoolConverter x:Key="InverseBoolConverter" />
<LinearGradientBrush x:Key="PopupDarkBorderBrush"
EndPoint="0.5,1"
StartPoint="0.5,0">
<GradientStop Color="#FFA3AEB9"
Offset="0" />
<GradientStop Color="#FF8399A9"
Offset="0.375" />
<GradientStop Color="#FF718597"
Offset="0.375" />
<GradientStop Color="#FF617584"
Offset="1" />
</LinearGradientBrush>
<LinearGradientBrush x:Key="PopupBackgroundBrush"
StartPoint="0,0"
EndPoint="0,1">
<LinearGradientBrush.GradientStops>
<GradientStopCollection>
<GradientStop Offset="0"
Color="#FFffffff" />
<GradientStop Offset="1"
Color="#FFE8EBED" />
</GradientStopCollection>
</LinearGradientBrush.GradientStops>
</LinearGradientBrush>
<Style TargetType="{x:Type local:DropDownButton}">
<Setter Property="BorderThickness"
Value="1" />
<Setter Property="IsTabStop"
Value="False" />
<Setter Property="HorizontalContentAlignment"
Value="Center" />
<Setter Property="VerticalContentAlignment"
Value="Center" />
<Setter Property="Background"
Value="{DynamicResource {x:Static themes:ResourceKeys.ButtonNormalBackgroundKey}}" />
<Setter Property="BorderBrush"
Value="{DynamicResource {x:Static themes:ResourceKeys.ButtonNormalOuterBorderKey}}" />
<Setter Property="Padding"
Value="3" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:DropDownButton}">
<Grid x:Name="MainGrid"
SnapsToDevicePixels="True">
<ToggleButton x:Name="PART_DropDownButton"
Grid.Column="1"
IsChecked="{Binding IsOpen, RelativeSource={RelativeSource TemplatedParent}, Mode=TwoWay}"
IsHitTestVisible="{Binding IsOpen, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource InverseBoolConverter}}">
<ToggleButton.Template>
<ControlTemplate TargetType="ToggleButton">
<ContentPresenter />
</ControlTemplate>
</ToggleButton.Template>
<Grid>
<chrome:ButtonChrome x:Name="ToggleButtonChrome"
Background="{TemplateBinding Background}"
Foreground="{TemplateBinding Foreground}"
BorderThickness="{TemplateBinding BorderThickness}"
BorderBrush="{TemplateBinding BorderBrush}"
CornerRadius="2.75"
RenderChecked="{TemplateBinding IsOpen}"
RenderEnabled="{TemplateBinding IsEnabled}"
RenderMouseOver="{Binding IsMouseOver, ElementName=PART_DropDownButton}"
RenderPressed="{Binding IsPressed, ElementName=PART_DropDownButton}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<ContentPresenter Margin="{TemplateBinding Padding}"
Content="{TemplateBinding Content}"
ContentTemplate="{TemplateBinding ContentTemplate}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
RecognizesAccessKey="true" />
<Grid x:Name="arrowGlyph"
IsHitTestVisible="False"
Margin="4,3,4,3"
Grid.Column="1">
<Path x:Name="Arrow"
Width="9"
Height="5"
Data="{StaticResource DownArrowGeometry}"
Fill="#FF000000"
Margin="0,1,0,0"/>
</Grid>
</Grid>
</chrome:ButtonChrome>
</Grid>
</ToggleButton>
<Popup x:Name="PART_Popup"
HorizontalOffset="1"
VerticalOffset="1"
AllowsTransparency="True"
StaysOpen="False"
Placement="{TemplateBinding DropDownPosition}"
Focusable="False"
IsOpen="{Binding IsChecked, ElementName=PART_DropDownButton}"
ToolTip="{x:Static sys:String.Empty}">
<Popup.Resources>
<Style TargetType="ToolTip">
<Style.Triggers>
<Trigger Property="Content"
Value="{x:Static sys:String.Empty}">
<Setter Property="Visibility"
Value="Collapsed" />
</Trigger>
</Style.Triggers>
</Style>
</Popup.Resources>
<Border BorderThickness="1"
Background="{StaticResource PopupBackgroundBrush}"
BorderBrush="{StaticResource PopupDarkBorderBrush}"
MaxHeight="{TemplateBinding MaxDropDownHeight}">
<ScrollViewer x:Name="DropDownScrollViewer"
VerticalScrollBarVisibility="Auto">
<ContentPresenter x:Name="PART_ContentPresenter"
Content="{TemplateBinding DropDownContent}" />
</ScrollViewer>
</Border>
</Popup>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled"
Value="False">
<Setter Property="Fill"
TargetName="Arrow"
Value="#AFAFAF" />
<Setter Property="Foreground"
Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>