Returns whether underscores in the label property are used as mnemonics on menu items on the overflow menu. See gtk_tool_button_set_use_underline().
%TRUE if underscores in the label property are used as mnemonics on menu items on the overflow menu.
2.4
See Implementation
Returns whether underscores in the label property are used as mnemonics on menu items on the overflow menu. See gtk_tool_button_set_use_underline().