This is not something available right out of the box. I have logged this issue in our backlog: RadRichTextEditor: GoToBookmark does not reposition to top of the screen. You can vote for it and subscribe to the task by clicking the Follow button so you can receive updates about status changes.
Fortunately, the desired behavior can be achieved by scrolling to the end of the document (for example) and then go to the bookmark. Note that there should be enough content after the bookmark for it to appear at the top of the page. Here is some sample code to show how you can achieve that:
if (this.radRichTextEditor1.RichTextBoxElement.ActiveEditorPresenter != null)
string bookmarkName = "Telerik";
I hope this information helps.
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