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\description{Returns whether an embedded underline in the button label indicates a
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mnemonic. See \code{\link{gtkButtonSetUseUnderline}}.}
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\usage{gtkButtonGetUseUnderline(object)}
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\value{[logical] \code{TRUE} if an embedded underline in the button label
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indicates the mnemonic accelerator keys.}
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\author{Derived by RGtkGen from GTK+ documentation}