Override this to draw custom graphics for this panel using the Sandbox.UI.Panel.Draw API.
<example><code>
public override void OnDraw()
{
var r = Box.RectInner;
Draw.Rect( r, Color.Blue.WithAlpha( 0.2f ), cornerRadius: 4 );
Draw.Text( "Score: 100", r, 16, Color.White, TextFlag.Center );
}
</code></example>