CSplitterWnd changin border thickness?!

The case:
One simple SDI programm, one CSplitterWnd class with to added panes.
Everything works fine, but the separationborder looks a kind of "old fashion"... I tried everything but didn't found a way to change the style...
please help me
[261 byte] By [paxer] at [2007-11-17 22:39:16]