_initBinds: function () {
    this.listenTo(this._layerContentModel, 'change:state', this._setViewState);
    this.listenTo(this._columnsModel, 'change:render', this._handleStats);
    this.listenTo(this._columnsCollection, 'change:selected', this._handleWidget);
    this.listenTo(this._overlayModel, 'change:visible', this._toggleOverlay);