Перезагрузить USERCONTOL WPF
public static class ExtensionMethods
{
private static readonly Action EmptyDelegate = delegate { };
public static void Refresh(this UIElement uiElement)
{
uiElement.Dispatcher.Invoke(DispatcherPriority.Render, EmptyDelegate);
}
}
//call on any UI Element like so:
//element.Refresh();
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