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TreeGrid dynamic loading and filtering problem

I have problems with treegrid dynamic and filtering:

In my treegrid parent nodes fills not only one (name) column, but some more values, and some of them are the same for parent and children nodes.

When I filter (text_filter) on column column that has same value like children and parent is collapsed then after filtering I cannot expand this node (clicking on + does nothing).
If I expand this node before filtering then everything works ok.

Yea, I know its kind of complicated but its simple to reproduce basing on treeGrid_dynamic.html sample:

1. Add text filtering to the header
2. Add more cell values to parent node with values from child nodes:

example:
<cell image="folder.gif">Honda</cell>
<cell>47,100</cell> <-same like in all child nodes

then try to filter by "47,100" and try to open the "Honda" node - no ajax request will be send and row will nod expand.

If you try to expand this node before filtering then everything works ok.

>>parent is collapsed then after filtering I cannot expand this node
Such behavior can be an expected one ( based on used filtering mode ), because grid doesn't know if data in not loaded branch correct for the used filtering rule or not - data loading blocked.  ( in other case , situation possible than data shown in grid will not be valid for used filtering rules )

>>then try to filter by "47,100"
Are you want to filter by top level only, by leaf level or data on all levels? Based on filtering mode - behavior may differ.
http://dhtmlx.com/docs/products/dhtmlxGrid/doc/articles/Filtering_in_TreeGrid.html#grid_tg_filtering

Which version of treegrid you are using? ( there was significent fixes related to support of dyn. loading and treegrid filtering in 2.1 version )

My grid version is latest one.

And I want to filter in top level

And one more thing, when you make filtering and then remove filter the "+" expand is still disabled.