Oxyplot annotation with brush
<p>I wish to colour my <code>OxyPlot</code>'s <code>RectangleAnnotation</code> with something more pretty than just a plain colour, i.e. some type of <code>brush</code> (<code>GradientBrush</code> etc.). I am working in WPF.</p>

<p>This question (<a href="https://github.com/oxyplot/oxyplot/issues/538" rel="nofollow">PlotAreaBackground can be defined using gradient ?</a>) on their GitHub site suggests that an annotation can be given a gradient, but I cannot find the suggested example.</p>

<p>Is there a way of applying a brush to a <code>RectangleAnnotation</code>? or any other way of creating coloured areas on a graph that are linked to the values on the axis?</p>