In order to use the MS style of the Checkbox control in our RadTreeViewItem control, you have to edit the control template of the control in Blend. After that you have to find the fowling code snippet in the xaml code.
Finally you have to remove the code in Yellow.
Please find attached an example.
If you have further questions please do not hesitate to ask us.
I hope this will help you.
the Telerik team
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