Emits the walkthroughRequested signal to display the given 
        walkthrough information.  This can be either a string name for a
        standard walkthrough, or an actual walkthrough instance.
        
        :param      walkthrough | <str> || <XWalkthrough>

def showWalkthrough(self, walkthrough, force=False):
        """
        Emits the walkthroughRequested signal to display the given 
        walkthrough information.  This can be either a string name for a
        standard walkthrough, or an actual walkthrough instance.
        
        :param      walkthrough | <str> || <XWalkthrough>
        """
        if type(walkthrough) in (str, unicode):
            walkthrough = self.findWalkthrough(walkthrough)

        if walkthrough:
            self.walkthroughRequested.emit(walkthrough, force)