Hello,

My application uses Ajaxtoolkit Modal Popup Extender and WebPart inside a panel to display the hierarchical webgrid.. If I dont use the popup extender the error doesn't appear. I did the same thing on WebGrid Sample.

I think sending a simple sample wouldn't help because while trying to replicate the error in WebGrid Sample I tried to compare properties with the falty application, but pages content are almost the same... its different only in datasource. Anyway.. could it be related to some kind of resources used by webgrid? I mean, last version used to work with webresources... the sample works fine even in a popup window.

TIA