Problem with Subgrid expand/ collapse

we are using a grid with subgrid and groupby functionality.

when i open all the subgrids and then collapse few of the subgrids, some subgrids are still displayed below the last row of the grid. also, the collapse functionality of the subgrids stops working.



Can you please provide us complete demo where we can reproduce his issue. Please send this example directly to the

I already provided a demo and the issue is confirmed by dhtmlx support in IE 7.0.