title: Add static text to TextBox
body: <p>I'm developing a custom <code>TextBox</code> for displaying and editing currency values. What I would like is to have a currency symbol visible within the <code>TextBox</code> on the left side. Overriding <code>OnPaint</code> of a <code>TextBox</code> is sort of horror after Googling and doing some tests. Anybody have other ideas? Maybe add the symbol as a background picture to the <code>TextBox</code> (if that is rather simple)? </p>