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PortfolioManager/ViewModels/PlotterWorkspaceViewModel.cs

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+using System;
+using ScottPlot.Avalonia;
+
+namespace PortfolioManager.ViewModels
+{
+    public class PlotterLoadedEventArgs : EventArgs
+    {
+        public AvaPlot AvaPlot { get; set; } = default;
+    }
+    
+    public abstract class PlotterWorkspaceViewModel : WorkspaceViewModel
+    {
+        public EventHandler<PlotterLoadedEventArgs> OnPlotterLoadedEventHandler;
+
+        public void OnPlotterLoaded(AvaPlot avaPlot)
+        {
+            EventHandler<PlotterLoadedEventArgs> handler = this.OnPlotterLoadedEventHandler;
+            if (null != handler) handler(this, new PlotterLoadedEventArgs() { AvaPlot = avaPlot });
+        }
+    }
+}