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is there a way to expand a subtreegrid using a function

is there a way to expand a subtreegrid using a function

If you mean sub-grids it can be done as

grid.cells(i,j).open();
where i,j - coordinates ( row id and column index ) of related sub_row_grid cell.

In case of treeGrid, the same can be done as 

grid.openItem(rowId);