Problem using tab key when open two Modal Pop up windows

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ASP.NET

HI,..

I have two ModalPopupExtender controls those are center and pincode popuops.

Click on Add new button. It will display the Add/Update Center popup window, In that click on New pincode image. It will display New pincode popup window, right now two popups open and press tab key the cursor is going to address bar of the browser. But, It should move to next field of pincode popup window


it's working perfectly when open one popup either center or pincode

but my task is first oepn the center popup after that open the pincode popup add pincode details...and close it now add center details.

pls.. help me any one ,

thank u.