Error “Specified element is already the logical child of another element”?

Question

I have a TabControl and each Tab can contain the same UI but with different data. In any tab the user can click on a button and bring up a popup. This sets a Style property to t

Answer 1

Make sure you're creating a new tab object and you're not trying to insert the same tab into the tab control a 2nd time. A control can only have 1 parent and it seems like the issue is you're trying to insert a tab into either 2 different containers, or more likely the same tab control twice.

Answer 2

To not read all the above the short answer is: you need to change Content to Template (in your XAML either style or direct declaration of ContentControl).

Answer 3

My problem was I was setting the Content in my Style, and Content cannot have more then one logical parent. I needed to move that to a Template instead. Since I didn't want to lose the base style, I set the content in the ContentTemplate property of the HeaderedContentControl (DraggablePanel in my code).

+1 to Davy anyways for helping me walk through this.