</H4>
<PRE CLASS="syntax">void	MSG_GEN_ITEM_GROUP_SET_SINGLE_SELECTION(
        word		identifier,
        Boolean		indeterminate);</PRE>
<P>
This message sets exactly one selection for a GenItemGroup. Any previously-selected items will be deselected, regardless of the GenItemGroup's behavior type. To set items without disturbing other settings, use <CODE>
MSG_GEN_ITEM_GROUP_SET_ITEM_STATE</CODE>
. If the list is on-screen, this message will cause a visual update. If the GenItemGroup is scrollable, this mess