Binding problem

Hello,

I got a big pb with ribbon, docking, usercontrol and binding. I want to bind data in a combo in a ribbon, to data and combo in a usercontrol put in a DocumentWindow. I do it twice (2 DocumentWindows, in wich I pur the same UC, one combo in the ribbon). I select the first tab, select element 2 in the combo : it's OK. Same thing in the second tab : it's OK. Now, I select the first tab, then the second tab : the first element is selected in the combo. I can send you a zip with the code.

Thanks