@property
    def cx(self):
        cx_str_lst = self.xpath('./a:xfrm/a:ext/@cx')
        if not cx_str_lst:
            return None
        return Emu(cx_str_lst[0])
Prompts that enable a user to upload a file to the Document List feed.
dataset/ETHPy150Open scanny/python-pptx/pptx/oxml/shapes/shared.py/CT_ShapeProperties.cx--crossover with--dataset/ETHPy150Open kuri65536/python-for-android/python-build/python-libs/gdata/samples/docs/docs_example.py/DocsSample._UploadMenu