protected override void DoGroupEnd()
{
if ( openGroupStack.Count > 0 )
{
curGroup = (RtfGroup)openGroupStack.Pop();
}
else
{
if ( structureRoot != null )
{
throw new RtfStructureException( Strings.MultipleRootLevelGroups );
}
structureRoot = curGroup;
curGroup = null;
}
}