gtkToolButtonSetUseUnderline
If set, an underline in the label property indicates that the next character
should be used for the mnemonic accelerator key in the overflow menu. For
example, if the label property is "_Open" and use.underline is TRUE,
the label on the tool button will be "Open" and the item on the overflow
menu will have an underlined 'O'.
gtkToolButtonSetUseUnderline(object, use.underline)
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whether the button label has the form "_Open" |
Labels shown on tool buttons never have mnemonics on them; this property only affects the menu item on the overflow menu. Since 2.4
Derived by RGtkGen from GTK+ documentation
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