code: function _pointMouseUp(e) {
          var self = e.target;
  
          self.focus();
  
          if (self.bezierEditor.dragElement) {
              self.bezierEditor.dragElement = null;
              self.bezierEditor._commitTimingFunction();
              self.bezierEditor._updateCanvas();
          }
      }
docs: Handle mouse up in <button> element
  
  @param {Event} e Mouse up event