Apply Filter on Expanded node only

[Manishkumar]

Hello,

I have a treelistview.  When user right click on an item and applies filter then I add one FilterDescriptor to the treelistview.
But it tries to filter on all the rows. My requirement is when user right click on any item then the filter should be applied only to the expanded nodes, not to those are collapsed nodes.

I have treelistview having upto 7 levels of expanded nodes. What i want is when user applies filter descriptor then it should filter all the data whose first level is expanded

Level 1 Level 2 Level 3 Level 4 Level 5 Level 6 Level 7

(-) Org
Dept 1
Cell 1
Mgr 1
Lead 1
Resp 1
Work1
Work2
Work3
Resp 2
Work4
Work5
Work6
(+) Dept 2
(+) Dept 3
(-) Dept4
Cell 4
Mgr 4
Lead 4
Resp 4
Work1
Work2
Work3
Resp 4
Work4
Work5
Work6


Dept 2 & Dept 3 are not in expanded state. While I filter I want the filter should be applied to those records of Dept 1 & Dept 4 only
User can right click on Level 7 data

.

[Manishkumar]

I am really stuck. Please help me asap. I just need how the FilterDescriptor can be applied to expanded node only rather than whole TreeListView