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Checkbox only for leafs and not folders

I have a DHTML Tree with check box enabled.

I need a functionality where in I want to display the checkbox only for the leafs and not for the folders.
How can I achieve this..?

tree.enableCheckBoxes(1) enables check boxes for all the nodes irrespective of weather its a folder or a leaf.

Please provide directions.

Thanks

You can show hide checkboxes for any necessary node(s) by
    tree.showItemCheckbox(id,state)
    tree.showItemCheckbox('1',false)   //hide checkbox for item with ID=1

To made things more simple , you can specify it directly in XML

<tree id="0">
    <item id="2" text="With checkbox" />
    <item id="3" nocheckbox="1" text="Without checkbox" />
</tree>