Hi Ricky Wu,
Our RadSplitButton is actually consisted of two buttons - RadButton and RadToggleButton. So you need set IsTabStop on both of them:
Or you can bind these to the IstabStop of their parent : IsTabStop={TemplateBinding IsTabStop}.
You can see this realized in the attached project.
Regards,
Petar Mladenov
the Telerik team
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