Call method inside iframe that holds a Cesium map
<p>I can normally call a method that is inside the html of an iframe using this approach: </p>

<pre><code>document.getElementById("frame_id").contentWindow.method_in_frame();
</code></pre>

<p>I can also call methods outside the iframe using the parent approach:</p>

<pre><code>onclick="parent.method_outside_frame(); 
</code></pre>

<p>But if my iframe is holding an instance of the Cesium map this does not work. Does cesium having something that stops this from happening? Is there a way to override it? </p>