Milian, After your help I was able to create 3 WS. But I was not able to understand the way of switching between them. This 4 quadrant icons are not so clear - they toggle the WS in some unclear way so that one of my WS is displayed once in 3 clicks. The other icon seems not to include the third WS at all. But this seems to be very close to what I wanted...:) -- Leon