on">
            remove existing table
        </paper-button>
        <template is="dom-repeat" items="{{project.migrationActions.removeTables}}">
            <paper-dropdown-menu label="select table" required>
                <paper-listbox class="dropdown-content" attr-for-selected="value" selected="{{selectedTable}}">
                    <template is="dom-repeat" items="{{existingTableNames}}">
                        <paper-item value="{{item}}">
                            {{item}}
                   