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Is it possible to keep the tree data type in open state itself . (I.e) the "+" icon should not be there and "-" icon should be there. (All the child and grand child of the tree should be shown.

Whenever i drag and drop the tree gets a + icon near it . Esp when the tree has one child . I want that to open out so that all the child are shown .. Can anybody help me out on how to change the behaviour

For dhtmlxTree - the simplest way to achieve such functionality will be to use next code

    tree.attachEvent("onDrop",function(id){
       tree.openItem(tree.getParentId(id));
    });

as result after each drag and drop operation the target element will be expanded

In case of dhtmlxTreeGrid solution may be similar , but will use setDropHandler instead of attachEvent