RadDropDownTree does not have a built in logic to determine whether the child items values equals the ones of their parent, the control is visualizing the hierarchical data passed to it. Details on this matter can be read and tested here:
As a possible option, you can compare manually the values of the child and parent items and hide the child item if they match. If you decide to go in this direction, you can do this check in the NodeDataBound event of the underlying TreeView of the control:
If this is not the scenario you want to achieve through, pleases end us a sample data where we can examine the exact structure you want to bind to RadDropDownTree so we can examine it at our end.
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