Situation:
There is a text in RichTextBox (with vertical ScrollBar).
A Toddler position of ScrollBar is in middle.

Problem:
How it is possible to add the information in RichTextBox (in the beginning and in the end) that the seen part of the text and toddler ScrollBar remained on a place?

RichTextBox.SelLength = 0
RichTextBox.SelStart = 0
RichTextBox.SelText = Incoming_String
RichTextBox.SelLength = 0
RichTextBox.SelStart = Return_To_Previous_Position

This code does not approach. It constantly scrolls The RichTextBox, because the information comes frequently.