Error: Excel Export Error: 'this.ColGroup.Cols' is null or not an object

[Chanan Zass]

Greetings,

We've encountered a problem when trying to export grid data in Excel format.
The error we get is always:

 

Error: 'this.ColGroup.Cols' is null or not an object

This is what we get when we enable the ShowExportToExcelButton.

Just for testing purposes, we created a button OUTSIDE the grid and placed this code in the CodeFile:

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        RadGrid1.MasterTableView.ExportToExcel()
End Sub

This works without a problem.

Any clue?

[Chanan Zass]

Please ignore my earlier question.
Should have read the manual before asking (again).

Reason for this error is probably due to the fact that "Generally speaking, the exporting feature of the control work with regular postbacks only."
Our grid is ajaxified, of course.
To read more about this problem, see here: http://www.telerik.com/help/aspnet-ajax/grdexportwithajax.html