   automatic management of the contained widget or layout. The
    properties available are largely the same as the builtin <a href="matlab:doc UIPANEL"><code class="FUNCTION">UIPANEL</code></a>
    object. Where more than one child is added, the currently visible
    child is determined using the SelectedChild property.</dd>
                 
                 <dt><code class="OUTARG">obj</code><code class="FUNCTION"> = uiextras.BoxPanel(</code><code class="INARG">&nbsp;prop</code><code class="FUNCTION">,</