how to configure widget direction

[miaocheng <snopy-xj 163 com>]

     I use red hat linux 8.0, the version of XFree86 is 4.0.3 and  the
desktop manager is Gnome.
   Is there any configurable options in GTK+ that control direction of
GTK+'s widget . After configuring it , I am able to make all widget's
direction of application with GTK+  being RTL (right to left) .
    Another question: In http://www.pango.org/gallery.shtml, The last
paragraph tell me GTK+ has the ability to mirror an interface
automatically. Children are inserted into containers in the opposite
order from the way they are displayed for left-to-right languages. This
can be done almost completely without assistance from the application
programmer.
     But I can't find the way to make interfaces mirrored . please tell
me how to make widget mirrored or where I can find resourses that
involve answers.
thanks