Mutliple Selection

I am battling to implement multiple selection in the new (V2) grid.

The only example code I can find in the examples is:

obj.setSelectionMode("single-row");

But this sets it to single row selection.I need to set it to something like

obj.setSelectionMode("multiple-row");

I have tried a number of variations but nothing seems to work. How do I set the grid to allow multiple selections?

Rick,

multiple selection is missing in beta1. This feature will be added to beta2.

Is this in Beta3?

If so, what is the syntax?

obj.setSelectionMode("multi-row");

works for me.