Steps to reproduce:
1)Launch FilechooserDemo
2)Select Motif L/F
3)Uncheck the "Show Control Buttons" checkbox
4)Click on "Show FileChooser" button
The file chooser dialog that pops up shows the control buttons even if the "Show Control Buttons" checkbox is unchecked.
On the other hand, the behavior is proper for Windows & Metal L/F i.e. the control buttons are not painted in the dialog box if "Show Control Buttons" checkbox is unchecked.