How to raise the Filters Collections Changed event

The Property changed event of the filter item will be raised whenever there is a change at checkbox of that filter Item at FilterPopup. Please refer the below code snippet which illustrate the same.

C#

Please use the FilterPopup.Closed event to perform the functions like collapse, collapse all , expand or expand all after each filtering, since these functionalities will close the popup once it done hence we could not proceed with the further operations like check/uncheck the filter item.