22 Jun 2020 14:41
Note : Issue in Current version of Telerik (2020.1.218.40)
On cheked of GridViewCheckBoxColumn (Multiple rows) in GridView grdFrReview_HeaderCellToggleStateChanged fires and header checkbox get checked. Header checkbox should check only if all check-boxes of current page checked, otherwise header checkbox should not checked. This was working fine in my previous version of Telerik (2018.3.1016.40).
In the screenshot shown i have checked 1st and then 2nd row of grid, you can see its headercheckbox status has been checked.