GtkRadioMenuItem Constructor
Creates a new radio menu item based on the current one.
This is a convenience method; with it you don't need to set
the radio button group.
Example 109. Creating radio menu items based on others.
$red = new GtkRadioMenuItem(null, '_Red', true);
$blue = $red->new_from_widget('_Blue', true);
$green = $red->new_from_widget('_Green');
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