RadBook and RadRichTextPageView (which is used in the templates of RadBook) do not implement a scaling mechanism.
However, you can use the built-in ScaleTransform and set different scaling values. This can be done like this:
ScaleX = scaleFactor,
ScaleY = scaleFactor,
CenterX = centerX,
CenterY = centerY
where centerX and centerY are the values you have calculated in order to show the scaled book in the position on page you would want it to appear.
the Telerik team
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