own,MouseButton">
  <dt><pre><span class="Keyword">proc</span> <a href="#down%2CMouseButton"><span class="Identifier">down</span></a><span class="Other">(</span><span class="Identifier">button</span><span class="Other">:</span> <a href="common.html#MouseButton"><span class="Identifier">MouseButton</span></a> <span class="Other">=</span> <span class="Identifier">mbLeft</span><span class="Other">)</span> {.<span><span class="Other pragmadots">...</span></span><span class="pragmawrap"><span class="Identifier">