app/views/templates/main.scala.html

<div class="modalDialog" data-bind="fadeVisible: modalDialog.isOpen" style="display: none;">
    <modal-dialog params="modal: modalDialog"></modal-dialog>
</div>

<message params="message: message"></message>
<main data-bind="template: {
    name: 'vertical_layout',
    foreach: layout.currentState.columns
}"></main>

<!-- ko foreach: {
            data: extensions,
            afterRender: registerExtension
        } -->
    <!-- ko component: {
        name: $data.widget,
        params: $root
    } -->
    <!-- /ko -->
<!-- /ko -->