Returns the row which component *comp* can be found in the 
        selections of, and is also a filename parameter

        :returns: int -- the index of the (filename) parameter *comp* is a member of

def fileParameter(self, comp):
        """Returns the row which component *comp* can be found in the 
        selections of, and is also a filename parameter

        :returns: int -- the index of the (filename) parameter *comp* is a member of 
        """
        for row in range(self.nrows()):
            p = self._parameters[row]
            if p['parameter'] == 'filename':
                # ASSUMES COMPONENT IN ONE SELECTION
                if comp in p['selection']:
                    return row