title: Can I make a widget visible when button is pressed?
body: <p>Is there any way for displaying a widget when a button is clicked ? But <strong>not</strong> as a pop up with <code>template = true</code> and <code>slotId = cockpitWidgetChildrenInvisible</code> like in this example :</p>
  
  <pre><code>&lt;widget-extension widgetId="mainSlot"&gt;
      &lt;widget id="paragraphsPopup" widgetDefinitionId="com.training.backoffice.widgets.paragraphspopup"
              slotId="cockpitWidgetChildrenInvisible" template="true"&gt;
          &lt;setting key="_width" type="String"&gt;500px&lt;/setting&gt;
          &lt;setting key="_height" type="String"&gt;auto&lt;/setting&gt;
          &lt;instance-settings&gt;
              // instance settings here for close / init / select.
          &lt;/instance-settings&gt;
          &lt;virtual-sockets/&gt;
      &lt;/widget&gt;
  &lt;/widget-extension&gt;
  </code></pre>
  
  <p>I want the widget to be invisible in a Default Portal Widget maybe in the <code>children</code> slot and when I press a button the widget becomes visible. (Again : <strong>NOT</strong> as a pop-up widget)</p>