></code></div>

		    
			
			<div class="method-subsection arguments-section parameters">
				<h4 class="method-subtitle parameter-title">Parameters</h4>
				<table class="argument-def parameter-def">
				
					<tr>
						<th scope="row" class="argument-name"><code>completion</code></th>
						<td><p>If the error is nil, the <a href="../Classes/Button.html">Button</a> Action started successfully, otherwise
it will not <a href="#//api/name/start">start</a> and you must handle the error.</p></td>
					</tr>
