lib/Ext/dataview/DataView.js
function(record, suppressEvent) {
        var me = this;
        if (me.container && !me.isDestroyed) {
            if (suppressEvent) {
                me.doItemDeselect(me, record);
            }
            else {
                me.fireAction('deselect', [me, record, suppressEvent], 'doItemDeselect');
            }
        }
    }
function(record, suppressEvent) {
        var me = this;
        if (me.container && !me.isDestroyed) {
            if (suppressEvent) {
                me.doItemDeselect(me, record);
            }
            else {
                me.fireAction('deselect', [me, record, suppressEvent], 'doItemDeselect');
            }
        }
    }
invoked by the selection model to maintain visual UI cues