GTK L&F: Moving from GTK L&F to other L&F leaves GTK traits in other L&F also
Steps to reproduce:
1) Open SwingSet2
2) Change to Motif L*F
3) Notice Internal Frame Generator & TabbedPane colors, they will look like
   in image Motif_BeforeGTK.png.
4) Switch to GTK L&F and than switch back to Motif L&F, notice
   some components still use GTK background colors.

Consider attached image(They are self explanatory)
- Motif_BeforeGTK.png: SwingSet2 view in Motif L&F before we switched to GTK
- Motif_AfterGTK.png: SwingSet2 view in Motif after we switch to motif from GTK

Note:
Tested on 1.4.2_04 Build 01
NOT Reproducible in Tiger b30

###@###.### 2003-12-15