Returns whether underscores in the label property are used as mnemonics on menu items on the overflow menu. See gtk.tool_button.ToolButton.setUseUnderline.
true if underscores in the label property are used as mnemonics on menu items on the overflow menu.
Returns whether underscores in the label property are used as mnemonics on menu items on the overflow menu. See gtk.tool_button.ToolButton.setUseUnderline.