Sets the filepath for this button to the inputed path.
        
        :param      filepath | <str>

def setFilepath( self, filepath ):
        """
        Sets the filepath for this button to the inputed path.
        
        :param      filepath | <str>
        """
        self._filepath = nativestring(filepath)
        self.setIcon(QIcon(filepath))
        if ( not self.signalsBlocked() ):
            self.filepathChanged.emit(filepath)