private static void ApplyCustomThumbSetting(Thumb thumb)
{
var dockItem = thumb.GetVisualAncestors().OfType <DockItem>().FirstOrDefault();
if (dockItem == null)
{
throw new ApplicationException("Cannot find parent DockItem or custom Thumb");
}
var enableCustomThumb = thumb.GetValue(IsCustomThumbProperty);
dockItem._customThumb = enableCustomThumb ? thumb : null;
dockItem._templateSubscriptions.Disposable = dockItem.SelectAndSubscribeToThumb().Item2;
if (dockItem._customThumb != null && dockItem._isTemplateThumbWithMouseAfterSeize)
{
Dispatcher.UIThread.InvokeAsync(
new Action(
() =>
dockItem._customThumb.RaiseEvent(new PointerPressedEventArgs(PointerPressedEvent)
{
ClickCount = 0,
Device = MouseDevice.Instance,
MouseButton = MouseButton.Left
})));
}
}