def init_gui(self):
     """
     Initialize GUI for this mode 
     """
     previousCommand = self.commandSequencer.prevMode 
     if previousCommand.commandName == 'BUILD_DNA':
         try:
             self.flyoutToolbar = previousCommand.flyoutToolbar
             #Need a better way to deal with changing state of the 
             #corresponding action in the flyout toolbar. To be revised 
             #during command toolbar cleanup 
             self.flyoutToolbar.breakStrandAction.setChecked(True)
         except AttributeError:
             self.flyoutToolbar = None
     
     if self.propMgr is None:
         self.propMgr = OrderDna_PropertyManager(self)
         #@bug BUG: following is a workaround for bug 2494.
         #This bug is mitigated as propMgr object no longer gets recreated
         #for modes -- niand 2007-08-29
         changes.keep_forever(self.propMgr)  
         
     self.propMgr.show()