Returns whether or not the grid lines should extend through the tree \
        area or not.
        
        :return <bool>

def extendsTree( self ):
        """
        Returns whether or not the grid lines should extend through the tree \
        area or not.
        
        :return <bool>
        """
        delegate = self.itemDelegate()
        if ( isinstance(delegate, XTreeWidgetDelegate) ):
            return delegate.extendsTree()
        return False