setting gtk theme/style using gtk_rc_parse

["Brian Ford" <bford rossvideo com>]

I am working on an embedded system using a GTK+ application as the front end.  We would like to be able to 
give the user the ability to change the GTK theme of the application from within a menu we create in our app. 
  I am currently using the gtk_rc_parse() function to set the theme by passing in a filename of the gtkrc 
file for the appropriate theme the user selects.  

Heres the problem though..  When switching from one theme to another, I need a way to clear all of the 
settings from the previous theme.  For example, the first theme may have set a background pixmap, but the 
second theme does not.  The background pixmap attribute does not get cleared and the second theme ends up 
using the background from the first.  

I have tried using gtk_rc_reset_styles() but it doesn't seem to be what I need in this case.  If I restart 
the application and just call gtk_rc_parse with the 2nd theme file everything is fine..  So there must be 
something called within gtk_init that defaults all of the style settings.

Thanks
Brian