I would say hotel = ""; would be enough
(if it's a normal variable then it and all its subvars will be deleted, if it's a TStaticVar then it will be deleted after a few moments if no other variable is linking to it anymore)
For the tree view menu:
PHP Code:
function MyTreeView.onOpenMenu(node, pathname, dotname) {
if (node.nodes.size()<=0)
MyContextMenu.open(mousescreenx,mousescreeny);
}