public MarginStub(MarginHandle marginHandle)
{
this.marginHandle = marginHandle;
}
/// <summary>
/// Decides the visiblity of handle/stub when <see cref="HandleLength"/> changes
/// </summary>
/// <param name="d"></param>
/// <param name="e"></param>
public static void OnHandleLengthChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
MarginHandle mar = (MarginHandle)d;
mar.DecideVisiblity((double)e.NewValue);
}