I have radgrid inside a radajaxpanel, inside a master page. I set EnableHeaderContextFilterMenu="True" EnableHeaderContextMenu="True". I've also set FilterCheckListEnableLoadOnDemand="true" for all columns. Every other element of the menu loads fine except for the checklist. When the checklist tries to load O get an error that reads:
"The target 'ctl00ContentPlaceHolder1xxxxxx' for the callback could not be found or did not implement ICallBackEventHandler. " If I continue every other element of the menu functions fine. It looks like there's some issue when it tries to load the checklist on demand. I followed the demo from your site for excel-like filtering here:
Am I missing something? The only difference beween my code and the code in the above linked demo is that I'm using a master page and the demo uses a sqldatasource control to set the ata source for the grid, while I bind to the grid using ado.net in the page_load event (if there's no posback).