UserControl in AJAX ModalPopupExtender in another UserControl

[pbjftw]

I am working on a ASP.NET (with Visual Basic) web application.I have been trying to make a user control for two days, but i have an issue that i could not solve.I have a FormView that I want to fill with an object, that i get from another user control. This second user control must be shown in a ModalPopupExtender when I click on an ImageButton. This works correctly. However, when i use the control, the modal popup is closed.I use the same user control in a ModalPopupExtender, in others .aspx pages, and it works correctly, so I don't think that the error comes from it. It fails only when the user control and ModalPopupExtender are used in another control.I show you some screenshots to explain easier :www.noelshack.com/2012-39-1348649045-1.png1 : .aspx web page,2 : Button which shows the popup,3 : .ascx user control,4 : Button which closes the popupThis configuration works correctly : I can use my user control and the popup is closed only when it must be.www.noelshack.com/2012-39-1348649045-2.png1 : .ascx user control,2 : ImageButton which shows the popup,3 : .ascx user control,4 : Button which closes the popupThe popup with the control is correctly opened, but when i try to search with the control (click on "RECHERCHER"), the popup is closed.www.noelshack.com/2012-39-1348649045-3.pngThen, if I click again on the ImageButton that shows the popupwww.noelshack.com/2012-39-1348649045-4.pngWe can see that the user control worked correctly.So the only problem is that the popup is closed when I try to use the user control.And this occurs only when i work in another user control, it works correctly in a page.Here is the part of my code where i use the popup and the user control :In the page, which works :www.noelshack.com/2012-39-1348649045-6.pngIn the user control, which does not work :www.noelshack.com/2012-39-1348649044-5.pngYou can ask me if you don't understand something or if you need more explanationsThank you for your help and sorry for my english. Sorry for the links, I can't post images or hyperlinks...