SearchPane: properly set focus on search box, if panel is first activated.

ILSpy/ViewModels/SearchPaneModel.cs

@@ -30,5 +30,11 @@ namespace ICSharpCode.ILSpy.ViewModels
 			Title = Properties.Resources.SearchPane_Search;
 			IsCloseable = true;
 		}
+
+		public override void Show()
+		{
+			base.Show();
+			MainWindow.Instance.SearchPane.Show();
+		}
 	}
 }

ILSpy/ViewModels/ToolPaneModel.cs

@@ -20,7 +20,7 @@ namespace ICSharpCode.ILSpy.ViewModels
 {
 	public abstract class ToolPaneModel : PaneModel
 	{
-		public void Show()
+		public virtual void Show()
 		{
 			this.IsActive = true;
 			this.IsVisible = true;