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If I set my RichTextBox width to "Auto" the width ends up being "134217728". I think this is because "134217728" represents the max width anything can be and the MaxWidth property of the RichTextBox is set to "Infinity." All of the RichTextBox's parent containers are also set to "Auto." How can I have my RichTextBox stretch to the full length of its parent container when all parent containers are set to Auto?