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loading a sub grid

When I set the cell type to be "sub_row_ajax" and expand the row the string "Loading..." appears before the data in rendered.
But when the cell type is set to "sub_row_grid" an horizontal bar appears, Instead is it possible to show the same string "Loading..." before the grid is rendered?

Latest version of subgrid excell add events which can be used to customize subgrid functionality.
While it not possible to fully mimic sub_row_ajax behavior - it possible to achieve similar effect.
Please check attached sample