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    <p>In the XML file defining the context menu, for each radio <code>&lt;menuitem&gt;</code> set <code>type="radio"</code> and the <code>group</code> property to the name of the radio item group, like this:</p> <pre><code>&lt;Root&gt; &lt;popups&gt; &lt;popup name="button3"&gt; &lt;menuitem name="Foo" verb="DoFoo" label="Foo is awesome" type="radio" group="mygroup"/&gt; &lt;menuitem name="Bar" verb="DoBar" label="Bar is cool" type="radio" group="mygroup"/&gt; &lt;menuitem name="Baz" verb="DoBaz" label="Baz rocks" type="radio" group="mygroup"/&gt; &lt;/popup&gt; &lt;/popups&gt; &lt;/Root&gt; </code></pre> <p>You don't set up handlers to respond to the items being selected the same way you would for normal menu items. Instead, you listen for the "ui-event" signal on the BonoboUIComponent for the menu:</p> <pre><code>BonoboUIComponent *component = panel_applet_get_popup_component (applet); g_signal_connect (component, "ui-event", G_CALLBACK (popup_component_ui_event_cb), NULL); /* ... */ static void popup_component_ui_event_cb (BonoboUIComponent *component, const gchar *path, Bonobo_UIComponent_EventType type, const gchar *state_string, gpointer data) { } </code></pre> <p><code>path</code> will be the full path (see below) of the item that was clicked. <code>state_string</code> will be the new state value of the item (see below). There will be two events for each click of a radio item: one to deselect the old item, and one to select the new one.</p> <p>To manipulate the checked state of the buttons, use <code>bonobo_ui_component_set_prop</code> to set the "state" property to "0" (unchecked) or "1" (checked). To be safe, explicitly uncheck the old value; there are some corner cases where you could otherwise wind up with multiple radio items in the same group checked (particularly if the context menu hasn't yet actually been drawn).</p> <pre><code>BonoboUIComponent *component = panel_applet_get_popup_component (applet); bonobo_ui_component_set_prop (component, "/commands/Foo", "state", "1", NULL); bonobo_ui_component_set_prop (component, "/commands/Bar", "state", "0", NULL); bonobo_ui_component_set_prop (component, "/commands/Baz", "state", "0", NULL); </code></pre> <p>Note that you identify the radio item by "/commands/name", where name is the name you gave the item in the XML file.</p> <p>You <em>could</em> likewise use <code>bonobo_ui_component_get_prop</code> to look for which radio item is checked, but you're better off using the event handlers to detect when the user clicks on one.</p> <p>In general, the <a href="http://library.gnome.org/devel/libbonoboui/stable/libbonoboui-bonobo-ui-component.html" rel="nofollow noreferrer">documentation for BonoboUIComponent in libbonoboui</a> should provide more information about ways to manipulate items in the menu.</p>
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    1. USPaul Kuliniewicz
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    1. COI *knew* I had done this before a while back, but had forgotten how. I finally found the four-year-old code buried on an external hard drive, which is what I used to derive the above answer. Given the paucity of views so far, I figured I might as well answer my own question.
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