dojo/cbtree uncheck all checkboxes and check selected checkbox

I want to make the checkbox work more or less like a radio button in this instance. This is what I have so far. I would like to be able to do this in the treeCheckboxClicked() function so that it would just uncheck all the remaining checkboxs then check the one that was selected.

buildTocTree: function (cp1) {
    var self = this;
            var toc = new TOC({
                checkboxes: false,
                enableDelete: true,
                deleteRecursive: true,
                showRoot: false,
                checkBoxes: false,
            }, self._viewId + '_tocTree');
    toc.on("checkBoxClick", dojo.hitch(this, "treeCheckboxClicked"));
},

treeCheckboxClicked: function (e) {  
            if (e.checked) {
                if (e.subLayers || e.name === 'GISLayer')
                    this.selectedLayerValue('');
                else if (e.layerInfos)
                    this.selectedLayerValue('');
                else
                    this.selectedLayerValue(e.name);

                if (this.selectedLayerValue() != '')
                    this._selectedGISSourceLayer = e;
                else
                    this._selectedGISSourceLayer = '';
            }
        }