@ButchersBoy : Thank You for fast response!
My issue step by step :
I know it's hard to guess what can be wrong, but I need only clue to investigate.
Dragablz.dll!Dragablz.Core.CollectionTeaser.Remove(object item) Line 63 C# Dragablz.dll!Dragablz.TabablzControl.RemoveFromSource(object item) Line 606 C# Dragablz.dll!Dragablz.TabablzControl.WindowOnClosing(object sender, System.ComponentModel.CancelEventArgs cancelEventArgs) Line 828 C#
PART_DragElementwhat is the purpose of that? In the sample you have it on a control that is not the content presenter... I thought it representet the actual content being dragged.