Styling the RadDocumentPane
For now the RadDocumentPane control is identical to the RadPane control as the RadDocumentPane inherits it. In that way the control properties and templates are the same and you can use the same approach to style it as with the RadPane control. To learn more about styling the RadPane read here.
You are able to set a style created for the RadPane control directly to the RadDocumentPane control without the need to change its TargetType, as the RadDocumentPane derives from the RadPane.