How to draw dropshadow effect in a geometry in WPF
<p>I'm drawing the following <code>Shape</code> in a <code>Canvas</code>. </p>

<p>I would like to <strong>highlight it</strong> when it's selected by <strong>changing its color</strong> (the easy part) and <strong>drawing an small halo</strong> around it:</p>

<p><a href="https://i.stack.imgur.com/itKHH.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/itKHH.png" alt="enter image description here"></a></p>

<p>This is how I did using SASS: <a href="http://codepen.io/aaromnido/pen/zKvAwd/" rel="nofollow noreferrer">http://codepen.io/aaromnido/pen/zKvAwd/</a></p>

<p>How coud I draw in WPF? Remember that I'm drawing using the <a href="https://msdn.microsoft.com/en-us/library/system.windows.shapes.shape.onrender(v=vs.110).aspx" rel="nofollow noreferrer">Shape's OnRender</a> method.</p>