private List <AvrTreeElement> RefreshTree()
{
LookupManager.ClearAndReload("LayoutFolder");
LookupManager.ClearAndReload("Layout");
LookupManager.ClearAndReload("Query");
LookupManager.ClearAndReloadOnIdle();
var model = AvrQueryLayoutTreeDbHelper.LoadQueriesLayoutsFolders();
Session["QueryTree"] = model;
return(model);
}