protected override void OnMarkerGeneratorReplaced(MarkerGenerator prevGenerator, MarkerGenerator currGenerator)
		{
			base.OnMarkerGeneratorReplaced(prevGenerator, currGenerator);

			if (renderingCanvas.Parent == null)
				CurrentItemsPanel.Children.Add(renderingCanvas);
		}
		protected override void OnMarkerGeneratorChanged(MarkerGenerator prevGenerator, MarkerGenerator currGenerator)
		{
			base.OnMarkerGeneratorChanged(prevGenerator, currGenerator);

			CurrentItemsPanel.Children.Add(renderingCanvas);
		}