Letting the Layout fill the whole area of the parent

[draGy]

Thx mate.
AlthoughI couldnt understand why it worked with you and not with me, I do know now.

My Problem was that I tried to put a layout on the tab before it had any widgets in it. But it only works once there is one widget in it. Then the layouts on the toolbar are enabled.

Thank you for helping (especially that fast).