cmsmon/frontend/components/formly/bs-grid-select.html

<div class="ui-select-container ui-select-multiple ui-select-bootstrap dropdown form-control">
    <span>
        <button type="button" class="ui-select-match-item btn btn-default btn-xs"
                style="min-width: 30px;"
                ng-click="model[options.key].splice($index,1)"
                ng-repeat="item in model[options.key] track by $index">
            {{item}}
        </button>
    </span>
    <div class="btn-group" uib-dropdown>
        <input class="ui-select-search input-xs" uib-dropdown-toggle>
        <ul uib-dropdown-menu role="menu" aria-labelledby="single-button">
            <li role="menuitem" ng-repeat="option in to.options track by $index">
                <a ng-click="add(option.value)">{{option.name}}</a>
            </li>
        </ul>
    </div>
</div>