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Thank you very very much!

Only the last post is right for me (I have forest: true) with commented line:

tree.addEvent('load', function(){
                tree.root.getChildren().each(function(node){
                    node.dropDenied.combine(['before','after','inside'])
               });
            });

The line: node.dropDenied.include('inside'); don't work.

Thanks a lot again.
Paul

and be sure, that root node exists. If you have forest: true, root node not exist(hidden) and you should do something like:

tree.addEvent('load', function(){
    tree.root.getChildren().each(function(node){
        node.dropDenied.include('inside');
        //or
        //node.dropDenied.combine(['before','after','inside'])
        //or what you want
   });
});

or use it in json:

[{
    "property": {
        "name": "root",
        "dragDisabled": true,
        "dropDenied": ["inside", "before", "after"]
    },
    "children": [
        {
            "property": {
                "name": "node1"
            }
        }
    ]
}]

Unfortunetally both doesn't work:(, in the second example firebug shows that

tree.root is undefined
in the line you wrote.
I put this line of code once before, and once after line

tree.load({...}), do you have any other idea? I could put here my code if you want

or

tree.root.dropDenied.include('inside');

try something like:

new Mif.Tree.Drag(this, {
    onDrag: function(){
        if(this.target == this.tree.root){
            this.where='notAllowed';
        }
    }
});