title: RichTextBox horizontal scroll not working
body: <p>I have a single line readOnly RichTextBox with wordWrap disabled, and I add programmatically one single very long line of text.</p>
  
  <p>However the horizontal scrollBar does not apear, even if I set <code>ScrollBars</code> to <code>ForcedHorizontal</code>.</p>
  
  <p>How can I fix this?</p>
  
  <p>I can navigate through the whole line if i use the arrow keys on the keyboard, but this only makes things worse.</p>