I used QTableView with QAbstractItemModel. I started with a table with only one row which has a "Add" button (I added it by setIndexWidget)
When clicking this button I add a new blank row. If the new row is inserted below it's fine, however if inserted above then the "Add" button in the old row disappears. However I wanted to insert above so the row with the "add" button is always at the bottom. Appreciate any input.

The calls I reimplemented:

Qt Code: 
  1. QVariant VarTableModel::data(const QModelIndex & index, int role) const
  2. {
  3.     QVariant var;
  4.  
  5.     if(index.isValid())
  6.     {
  7.  
  8.         if(role == Qt::DisplayRole)
  9.         {
  10.             // the last row is just the "Add" button, no data
  11.             if((index.column() == 2) && (index.row() != rowCount()-1))
  12.             {
  13.                 int idx = getDesignVarIndexFromRow(index.row());
  14.                 if(idx >= 0)
  15.                 {
  16.                     Variable desVar = designVariables.at(idx);
  17.                     QString exp;
  18.                     createVarExpFromStruct(desVar, exp);
  19.                     var.setValue(exp);
  20.                 }
  21.             }
  22.         }
  23.         else if(role == Qt::CheckStateRole)
  24.         {
  25.             if((index.column() == 1)  && (index.row() != rowCount()-1))
  26.             {
  27.                 enum Qt::CheckState flags;
  28.  
  29.                 int idx = getDesignVarIndexFromRow(index.row());
  30.                 if(idx >= 0)
  31.                 {    
  32.                     Variable desVar = designVariables.at(idx);
  33.                     if(desVar.enabled)
  34.                     {
  35.                         flags = Qt::Checked;
  36.                     }
  37.                     else
  38.                     {
  39.                         flags = Qt::Unchecked;
  40.                     }
  41.                 }
  42.                 else
  43.                 {
  44.                     flags = Qt::Checked;
  45.                 }
  46.                 return flags;
  47.             }
  48.         }
  49.     }
  50.     return var;
  51. }
  52.  
  53. //----------------------------------------------------------------------------
  54. bool VarTableModel::setData(const QModelIndex& index, const QVariant& value, int role)
  55. {
  56.     if(role == Qt::CheckStateRole)
  57.     {
  58.         int idx = getDesignVarIndexFromRow(index.row());
  59.         if(idx >= 0)
  60.         {    
  61.             Variable desVar = designVariables.at(idx);
  62.  
  63.             if(value == Qt::Checked)
  64.             {
  65.                 desVar.enabled = true;
  66.             }
  67.             else
  68.             {
  69.                 desVar.enabled = false;
  70.             }
  71.         }
  72.     }
  73.     emit dataChanged(index, index);
  74.     return true;
  75. }
  76.  
  77.  
  78. Qt::ItemFlags VarTableModel::flags ( const QModelIndex & index ) const
  79.  {
  80.      if(index.column() == 1)
  81.      {
  82.          if(index.row() != rowCount()-1)
  83.          {
  84.             return Qt::ItemIsSelectable | Qt::ItemIsUserCheckable | Qt::ItemIsEnabled | Qt::ItemIsEditable;
  85.          }
  86.          else // last row with "Add" button
  87.          {
  88.             return Qt::ItemIsSelectable | Qt::ItemIsEnabled | Qt::ItemIsEditable;
  89.          }
  90.      }
  91.      else
  92.      {
  93.          return QAbstractItemModel::flags(index);
  94.      }
  95.  }
  96.  
  97. //----------------------------------------------------------------------------
  98. bool VarTableModel::insertRow(int row, const QModelIndex & parent)
  99. {
  100.     beginInsertRows(QModelIndex(), row, row);
  101.     endInsertRows();
  102.     return true;
  103. }
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