[haiku-appserver] Some Bugs

Howdy,

while working on the shutdown window I encountered a few bugs:

* I have a button that I Hide() before Show()ing the window and Show() at a 
later time (the "Reboot System" button). The Show() doesn't cause the 
button to draw itself. Manually invoking Invalidate() on it works around 
the problem.

* The text in the shutdown window (a BTextView) is no longer drawn. This is 
a recently introduced bug (in the last 48 hours or so). Before I updated 
the tree today it did work properly.

* Also introduced recently: The tab of the window is no longer drawn 
correctly. Its right side has a hole, probably where the zoom button should 
be. But the window is B_NOT_ZOOMABLE.

CU, Ingo

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