text: blockManager.add('col100_tablet50', {
      label: 'Col-100 Tablet-50',
      attributes: {
          class: 'fa fa-square',
          title: 'Col-100 Tablet-50'
      },
      content: '<div class="row">' +
          '   <div class="col-100 tablet-50" style="min-height:25px;"></div>' +
          '   <div class="col-100 tablet-50" style="min-height:25px;"></div>' +
          '</div>',
      category: 'Grid Responsive'
  });
  
  blockManager.add('col25_tablet50', {
      label: 'Col-25 Tablet-50',
      attributes: {
          class: 'fa fa-square',
          title: 'Col-25 Tablet-50'
      },
      content: '<div class="row">' +
          '   <div class="col-50 tablet-25" style="min-height:25px;"></div>' +
          '   <div class="col-50 tablet-25" style="min-height:25px;"></div>' +
          '   <div class="col-50 tablet-25" style="min-height:25px;"></div>' +
          '   <div class="col-50 tablet-25" style="min-height:25px;"></div>' +
          '</div>',
      category: 'Grid Responsive'
  });