Hi Peter,
Thank you for writing.
You can subscribe to the
NodeCheckedChanging of the tree view found inside the filter popup. Here is how to do that:
You will notice there is a boolean flag which is needed because when the tree view is populated with the data from the current filter(s) the event is fired. This happens when the filter popup is opened. Another thing to note is that inside the
NodeCheckedChanging event handling method the node
Checked property has the old value and not the value that is about to be assigned to it.
I hope this will be useful. Should you have further questions, I would be glad to help.
Regards,
Ivan Petrov
Telerik