One of the possible approaches you can adopt is to extract the template of RadImageEditor which will give you access to the ScrollViewer.
As an alternative and slightly hacky approach, you can use the ChildrenOfType extension to access the scroll viewer. For example, try subscribing to the CommandExecuted event like this:
sender, Telerik.Windows.Media.Imaging.ImageEditorCommands.ImageCommandExecutedEventArgs e)
ScrollViewer scroll =
I hope this helps.
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