.DefineIcon('popupButton1', { NAME: 'bell-o', SVG_KEY: 'anchors' });
    FroalaEditor.RegisterCommand('popupButton1', {
      title: 'Button 1',
      undo: false,
      focus: false,
      callback: function () {
        alert("popupButton1 was pressed");
      }
    })

    // Define custom popup 2.
    FroalaEditor.DefineIcon('popupButton2', { NAME: 'bullhorn', SVG_KEY: 'tags' });
    FroalaEditor.RegisterCommand('popupButton2', {
      title: 'Button 2',
      undo: false,
      focus: false,
      call