title: UpdatePanel not refreshing display
body: <p>I have an UpdatePanel inside of a custom control, and within that UpdatePanel are two placeholders.  One is initially set Visible = false, the other true.  Inside the visible one I have an ImageButton that toggles the visibility of the placeholders.</p>
  
  <p>I'm using this control on two different pages in my site.  On the home page it works as expected, on the other page clicking the button triggers the event (I can put a breakpoint in and it will trigger), but the screen doesn't update.  None of the other buttons in the updatepanel seem to work either.</p>
  
  <p>Both pages share the same master page, which contains a scriptmanager.</p>
  
  <p>Any Ideas?  I'm afraid I can't post code because of client agreements, but I've tried to outline the situation as best as I can.</p>