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is a <a class="link" href="GtkLabel.html" title="GtkLabel"><span class="type">GtkLabel</span></a> or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, then the menu label will be
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a newly created label with the same text as <em class="parameter"><code>tab_label</code></em>;
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If <em class="parameter"><code>tab_label</code></em> is not a <a class="link" href="GtkLabel.html" title="GtkLabel"><span class="type">GtkLabel</span></a>, <em class="parameter"><code>menu_label</code></em> must be
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>