Thank you for the question.
You are correct. Currently, only the ExplorerBar layout is available in the Visual Style Builder. Properties specific to the other GroupStyles could be only programmatically set.
Regarding the captions of the groups, the ExplorerBar GroupStyle share common properties with the OutlookNavPane GroupStyle. So, the properties that you apply to the captions in Visual Style Builder will be applied to a RadPanelBar with OutlookNavPane GroupStyle.
In case you want to set properties of OutlookNavPane's specific elements, RadControlSpy
will be of great help to you. It will show you RadPanelBar's elements hierarchy and you will be able to set various properties of these elements through code.
If there is something specific that you want to set, but you need help, I will be glad to assist you further.
the Telerik team
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