bool IsDragArea(object sender, MouseEventArgs e, TabItem tabItem) => IsDraggableAP.GetIsDraggable(e.OriginalSource as FrameworkElement);
bool IsDragArea(object sender, MouseButtonEventArgs e, TabItem tabItem) { return(IsDraggableAP.GetIsDraggable(e.OriginalSource as FrameworkElement)); }