text: /**
   * @desc 
   * @author Michael Kaserer
   **/
  function Toolbox() {
      this.tools = {
          'Window level': new WindowLevel(),
          'Zoom': new Zoom(),
          'Move': new Move(),
          'Roi': new Roi()
      };
       this.currentTool = this.tools['Window level'];
  }
  
  /**
   * Sets the currentTool by its name.
   * @param {String} funcName
   */
  Toolbox.prototype.setCurrentTool = function(funcName) {
      this.currentTool = this.tools[funcName];
  };