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.