Shapes of widgets in GTK???

[<pushpalata patil soc-soft com>]

Hi All,

 

 I wanted to change shape of a widget like round, oval buttons.  Is it possible to change shape  using gtk  theme concept ?

 

 1) How to change button shapes ,different style lines ?

 2) How to mask button with image(pixmap->png,xpm etc) ?

 

 

Thanks and Regards,

Pushpa