Hello Steven,
With the new Excel-like filtering (
through the HeaderContextMenu) you could achieve the desired result within the OnFilterCheckListItemsRequested event, where you could get the list with the selected values in the already filtered columns in the following manner:
Once you get the checked values in the other columns you could filter the data before setting it to the ListBox.
Hope this helps.
Regards,
Konstantin Dikov
Telerik
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