decodeStatusIcon
@param {Object} status
function(status) {
        var iconCls = '';
        switch (status) {
            case true:
            case this.STATUS_OK:
                iconCls = this.ICON_OK;
                break;
            case this.STATUS_NOTICE:
                iconCls = this.ICON_NOTICE;
                break;
            case false:
            case this.STATUS_ERROR:
                iconCls = this.ICON_ERROR;
                break;
            case this.STATUS_HELP:
                iconCls = this.ICON_HELP;
                break;
        }
        return iconCls;
    }