aving the interface</p>
<pre class="fssnip highlighted"><code lang="fsharp"><span class="k">type</span> <span onmouseout="hideTip(event, 'fs8', 11)" onmouseover="showTip(event, 'fs8', 11)" class="if">IButtonPusher</span> <span class="o">=</span>
    <span class="k">abstract</span> <span class="k">member</span> <span class="fn">PushButton</span><span class="pn">:</span> <span onmouseout="hideTip(event, 'fs9', 12)" onmouseover="showTip(event, 'fs9', 12)" class="rt">unit</span> <span class="k">-&gt;</span> <sp