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Expanding child grids programmatically

Attached test01 project and I need you to help me with the following :

Currently when UnoHGrid.aspx is run and Tab2 is chosen you would see a hierarchical grid

With all child grid collapsed. While I am aware of the InitialExpandDepth="1"

 property that would expand all child grids when they got initialized, it does not work in my production project that has seven tabs and lots of controls and truck load data from the sql server..  I cannot send it and if I take the page and remove all db dependencies it started to work.

Here what I need you to show me how I can expand child grid programmatically .. on the grid initialization event and on the tab activation. so the user would see the grid expanded on the opening…  (Claymation & defaults removed bc of the size)