I have been searching for the answer here and internet for two days already, but no luck.
Here is the sutiation.
WebForm has TabContainer.
TabContainer contains many one-type WebUserControls (A) bound with different data.
Error: Sys.WebForms.PageRequestManagerServerErrorException: Specified argument was out of the range of valid values. Parameter name: index.
I have another page that has the same scenario but instead of TabContainer uses asp:DataGrid. The DataGrid contains the very same one-type WebUserControls (A). But in this case everything works fine.
I appreciate any ideas/help.
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