private TransitionGroupDocNode CreateChoice(Identity childId, ExplicitMods mods)
{
TransitionGroup tranGroup = (TransitionGroup)childId;
TransitionDocNode[] transitions = DocNode.GetMatchingTransitions(
tranGroup, DocSettings, mods);
var nodeGroup = new TransitionGroupDocNode(tranGroup, transitions);
return(nodeGroup.ChangeSettings(DocSettings, DocNode, mods, SrmSettingsDiff.ALL));
}