Object graph - highlights edge on node item mouse-over.

src/AddIns/Debugger/Debugger.AddIn/Visualizers/Graph/Drawing/PositionedGraphNodeControl.xaml

@@ -29,6 +29,8 @@
             </ListView.Background>
             <ListView.ItemContainerStyle>
                 <Style TargetType="{x:Type ListViewItem}">
+                	<EventSetter Event="MouseEnter" Handler="ListViewItem_MouseEnter"></EventSetter>
+                	<EventSetter Event="MouseLeave" Handler="ListViewItem_MouseLeave"></EventSetter>
                     <Setter Property="Background" Value="Transparent" />
                     <Setter Property="Margin" Value="0"></Setter>
                     <Setter Property="BorderThickness" Value="1" />
@@ -73,7 +75,6 @@
                                                     Property="Visibility" Value="Collapsed"/>
                                             </DataTrigger>
                                         </DataTemplate.Triggers>
-											
                                     </DataTemplate>
                                 </GridViewColumn.CellTemplate>
                             </GridViewColumn>

src/AddIns/Debugger/Debugger.AddIn/Visualizers/Graph/Drawing/PositionedGraphNodeControl.xaml.cs

@@ -197,6 +197,25 @@ namespace Debugger.AddIn.Visualizers.Graph.Drawing
 			if (this.ContentNodeCollapsed != null)
 				this.ContentNodeCollapsed(this, new ContentNodeEventArgs(node));
 		}
+		
+		void ListViewItem_MouseEnter(object sender, MouseEventArgs e)
+		{
+			SetEdgeStrokeThickness((ListViewItem)e.Source, 2);
+		}
+
+		void ListViewItem_MouseLeave(object sender, MouseEventArgs e)
+		{
+			SetEdgeStrokeThickness((ListViewItem)e.Source, 1);
+		}
+		
+		void SetEdgeStrokeThickness(ListViewItem listViewItem, int thickness)
+		{
+			var clickedNode = (ContentNode)listViewItem.DataContext;
+			var propNode = clickedNode as ContentPropertyNode;
+			if (propNode != null && propNode.Property != null && propNode.Property.Edge != null && propNode.Property.Edge.Spline != null) {
+				propNode.Property.Edge.Spline.StrokeThickness = thickness;
+			}
+		}
 		#endregion
 	}
 }