I have two user controls on a master page.  I can easily bubble up an
event on usercontrol 1 from a click event to the page.aspx, than then
calls a method on the masterpage, but this causes the screen to do a
postbacka nd full load.  What I'm doing is i have a button on one user
control that when clicked it will dynamically load a usercontrol into
a placeholder on the masterpage.  I know that if I were to put
everything into an update panel that it would work, but I do not want
to do this because there is other stuff in the page already and that
would cause to much over head.  I want to know if there is a way to
ajax the button in the usercontrol to cause this other user control to
load dynamically into the masterpage.  Any ideas would greatly be
appreciated.

Thanks,

Risso