Help!I lost my 'Pad View' Window!

It's like this:before I dragged it, the 'Groups List' was between the 'Accelerator Bar' and the 'Top View' window, with a smaller size;after I dragged it, I cannot adjust its size and I have to put it in a position that I feel unconfortable.

I think I can accept the unconvenient above; the real problem is : I click "View -> Pad View", and there's already a black dot there, which I think means I've chosen the 'Pad View', but what I see is still the 'Top View';weird thing, I re-click "View -> Pad View", and the black dot is still there; I cannot delete that.

I will upload some pictures later; the internet connections are not so good here at this time.

Thanks!