Windows Server 2008 R2. IIS 7. ASP.Net Framework 4.5. Ajax Toolkit Version 7.1213 (Dec 2013) for .NET 4.5.
I have a tab control on a page with multiple tabs. I defined OnDemand="true" for the main tab control. My expectation is that the content on each tab is not activated or loaded until that tab is selected. HOWEVER, the content on one of my tabs (which includes a panel with databound dropdownlists, listboxes, etc.), goes right ahead and databinds the controls when the page comes up. Why is this happening? I have an onload event handler for the asp:panel control contained on the tab, and it actually hits twice when the page comes up and the tab panel is NOT selected. Argh!