private static void OnLeftChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
CanvasItemControl target = (CanvasItemControl)d;
Canvas.SetLeft(target, target.Left);
target.OnPropertyChanged("Left");
}
private static void OnTopChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
CanvasItemControl target = (CanvasItemControl)d;
Canvas.SetTop(target, target.Top);
target.OnPropertyChanged("Top");
}