private List <ITreeNode> GetAllChildTreeNodes(InOperator inOperator, string propertyName)
{
var allTreeNodes = new List <ITreeNode>();
XPCollection treeNodes = GetTreeNodes(propertyName, inOperator);
if (treeNodes != null)
{
allTreeNodes = treeNodes.Cast <ITreeNode>().ToList().GetAllTreeNodes();
}
return(allTreeNodes.Distinct().ToList());
}