modelpopup extender dynamic added server control, and this server control is in updatepanel.

hi all, 

as my topic.  i have created a customized server control with Modelpopup.  I know to avoid modelpopup to working incorrect is to 

place the modelpopup ext outside the updatepanel.  but, how if my customized server control are required to put in updatepanel, 

and this content with modelpopup?

Regards,

MH