* Constructor. Sets PObject to Shift.
* @param applet The <em>controller</em> object.
*/
public ShiftButton( CalculatorApplet applet ){
this.applet = applet;
this.pobject = new Shift();
setText();
setTextSize();
tooltip = "use to select 2nd/inverse function on some keys";
shortcut = ' ';
setToolTipText();