title: Call (show) a modal popup located in MasterPage from it's childs
body: <p>I'm trying to make a default modal box that must be accessible from any part of the application, and need to be called whenever I want from inside any page. (must be called from code-behind).</p>
  
  <p>So I came up with the idea of a Panel + modalPopupExtender placed in the MasterPage, and calling it from child pages via code-behind. </p>
  
  <p>How can I do that? Or perhaps you guys have a better idea to solve this.</p>