How do I create a dasboard with one window and multiple tabs?
I created a dashboard like this:

It shows the 1st main grid, MainGrid, in one window and two grids, Tab1 & Tab2, in another 2nd window.
How do I move Tab1 & Tab2 on top of the MainGrid window so that all three grids are in one window only with three Tabs: MainGrid, Tab1 & Tab2?
