public override void OnApplyTemplate()
{
base.OnApplyTemplate();
IsManipulationEnabled = true;
_itemsControl = GetTemplateChild("PART_ItemsControl") as ItemsControl;
if (_itemsControl == null) return;
_itemsControl.ApplyTemplate();
var factoryPanel = new FrameworkElementFactory(typeof(ZoomableCanvas));
factoryPanel.AddHandler(LoadedEvent, new RoutedEventHandler(ZoomableCanvasLoaded));
_itemsControl.ItemsPanel = new ItemsPanelTemplate(factoryPanel);
if (_spatialSource != null)
_itemsControl.ItemsSource = _spatialSource;
}
