">   60</span>&#160; </div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;    <span class="keyword">protected</span>:</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;        <span class="comment">// A helper to clear this display back to the initial state.</span></div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;        <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="cod