code: function(delay) {
  			if(this.isTurnedOff){
  				return;
  			}
  			if (this.isShowing()) { //$NON-NLS-0$
  				return;
  			}
  			if (this._timeout) {
  				window.clearTimeout(this._timeout);
  				this._timeout = null;
  			}
  			var showDelay = delay !== undefined ? delay : this._showDelay;
  			if (showDelay) {
  				this._timeout = window.setTimeout(this._showImmediately.bind(this), showDelay);	
  			} else {
  				this._showImmediately();
  			}
  		}
docs: Show the tooltip.