'Return a list of all the styles used by all the elements joined
to the root element
@todo: parameter description'

def joinedElementStyles(self, rootElement):

    styleList = []
    row = rootElement.row
    col = rootElement.col
    for v in xrange((rootElement.mergeV + 1)):
        for h in xrange((rootElement.mergeH + 1)):
            newPosn = ('%s,%s' % ((row + v), (col + h)))
            styleList += self.matrix[newPosn].styleList
    return styleList
