I suggest you use Implicit Styles
to achieve the described approach. This is the most efficient way of
customizing the Telerik themes. The xaml file of desired theme can be found inside Theme.Implicit subfolder of your local RadControls installation folder.
In order to change the size of Width of the ScrollViewer
you have to edit the template of the control. I have attached a sample project with the change, just search for a comment starting with "Note:".
Hope this helps. Let me know if you have further questions.
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