def adata():
    adata = ad.AnnData(np.zeros((100, 100)))
    adata.obsm["o"] = np.zeros((100, 50))
    adata.varm["o"] = np.zeros((100, 50))
    return adata
def _setup_item_button(self, item_button, icon, position=None):
    item_button.set_relief(gtk.RELIEF_NONE)