I have a .NET 4.5 web application that uses a master page. The master page wraps the main content container in an update panel. The page I'm working on has a tab control and a form view on the tab panel. Inside the form view, I have a textbox that triggers the display of a panel using the AJAX BalloonPopupExtender. When I run the application, the balloon appears blank without me ever clicking on my textbox to trigger it. Then when I click on the textbox, the appropriate balloon popup is displayed with the actual data in my panel and the original blank one disappears. If I click away then, the balloon disappears all togther and everything works as epected after that. I have no idea why the balloon appears blank when I first load the page though. Any ideas? Any thoughts on how to force it to hide until it is actually triggered?
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