tance data. Whenever the user makes any selection, the group will be marked modified. </P>
<P>
To check whether a GenItemGroup is indeterminate, send it a <CODE>
MSG_GEN_ITEM_GROUP_IS_INDETERMINATE</CODE>
. The message will return <CODE>
true</CODE>
 if the list is indeterminate, <CODE>
false</CODE>
 if it is not. </P>
<P>
To set a GenItemGroup indeterminate, send it <CODE>
MSG_GEN_ITEM_GROUP_SET_INDETERMINATE_STATE</CODE>
. Note that the messages to set a GenItemGroup's selections already provide an argume