bsp;&nbsp;<br>
&nbsp;&nbsp;<span class=keyword>if</span>&nbsp;<span class=stack>nargin</span>&nbsp;&gt;=1,&nbsp;options&nbsp;=&nbsp;c2s(<span class=stack>varargin</span>{1});&nbsp;<span class=keyword>else</span>&nbsp;options=[];&nbsp;<span class=keyword>end</span><br>
&nbsp;&nbsp;<br>
&nbsp;&nbsp;<span class=comment>%&nbsp;function&nbsp;called&nbsp;when&nbsp;middle&nbsp;button&nbsp;is&nbsp;pressed</span><br>
&nbsp;&nbsp;<span class=keyword>if</span>&nbsp;~isfield(&nbsp;options,&nbsp;<span class=quotes>'fun'