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pass subgrid into its onKeyPress event

I have a subgrid and am attaching an event to it:

subgrid.attachEvent("onKeyPress",doOnSubGridKeyPress);

when the event is raised, how can I determine which subgrid raised it?

function doOnSubGridKeyPress(code,ctrl,shift)
{

// i can do something like this but if the parent grid row
// is not selected, then this fails
var subgrid = grid.cells(grid.getSelectedRowId(),0).getSubGrid();
}

is it possible to pass in the subgrid into the event?

subgrid.attachEvent("onKeyPress",doOnSubGridKeyPress(subgrid));

i tried the above but it didnt work.

"this" will point to the grid instance, this is work for all events. 
function doOnSubGridKeyPress(code,ctrl,shift) 
{ 
var subgrid = this;
}