I am not sure what you need to implement. If you want to control the enabled state of the entire RadSplitButton through its IsEnabled property rather than through the returned result from the CanExecute() method of the command, then unfortunately this isn't possible at the moment. However, we have logged this issue in our PITS, where you can track its progress and vote for it thus increasing its priority.
If you want to disable the RadSplitButton but leave its DropDown part enabled, you can modify the ControlTemplate of the button to implement this scenario. I attached a sample project illustrating a possible approach.
I hope this info will help you.
Regards,
Tina Stancheva
the Telerik team
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