* Constructor. Sets PObject to Off.
* @param applet The <em>controller</em> object.
*/
public OffButton( CalculatorApplet applet ){
this.applet = applet;
this.pobject = new Off();
setText();
setTextSize();
tooltip = "use to switch calculator off: memory and<br>" +
" statistics memory are <i>not</i> cleared";
shortcut = 'Q';