Hello.
I have on class that subclass QAbstractTableModel, like this:
Qt Code: 
  1. class CTableModel : public QAbstractTableModel
  2. {
  3. 	Q_OBJECT
  4.  
  5. public:
  6. 	CTableModel(QObject *parent=0);
  7. 	virtual ~CTableModel();
  8.  
  9. 	int rowCount(const QModelIndex &parent = QModelIndex()) const;
  10. 	void setRowCount(int numRows);
  11. 	int columnCount(const QModelIndex &parent = QModelIndex()) const;
  12. 	void setColumnCount(int numColumns);
  13.  
  14.     QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
  15.     bool setData(const QModelIndex &index, const QVariant & value, int role = Qt::EditRole );
  16.  
  17.     void setHorToolTipList(QStringList lista);
  18.     Qt::ItemFlags flags ( const QModelIndex & index ) const;
  19.  
  20.    	QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;
  21.     bool setHeaderData( int section, Qt::Orientation orientation, const QVariant & value, int role = Qt::EditRole);
  22.  
  23. private:
  24. 	QVector< QVector <QString> > items;
  25. 	QStringList horHeaders,verHeaders,horToolTip;
  26.  
  27. };
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And the .cpp,
Qt Code: 
  1. int CTableModel::rowCount(const QModelIndex &parent) const
  2. {
  3. 	return items.count();
  4. }
  5.  
  6. void CTableModel::setRowCount(int numRows)
  7. {
  8. 	if (numRows > rowCount())
  9. 	{
  10. 		int tamAnt = rowCount();
  11. 		items.resize(numRows);
  12.  
  13. 		for (int i=tamAnt;i<numRows;i++)
  14. 			items[i].resize(columnCount());
  15. 	}
  16. 	else
  17. 	{
  18. 		if (numRows < rowCount())
  19. 		{
  20. 			items.resize(numRows);
  21. 		}
  22. 	}
  23.  
  24. }
  25.  
  26. int CTableModel::columnCount(const QModelIndex &parent) const
  27. {
  28. 	if (items.count() == 0)
  29. 		return 0;
  30. 	return items[0].count();
  31. }
  32.  
  33. void CTableModel::setColumnCount(int numColumns)
  34. {
  35. 	for(int i=0;i<items.count();i++)
  36. 		items[i].resize(numColumns);
  37. }
  38.  
  39. QVariant CTableModel::data(const QModelIndex &index, int role) const
  40. {
  41. 	if (index.isValid())
  42. 	{
  43. 		if (role == Qt::DisplayRole)
  44. 			return items[index.row()][index.column()]; 
  45. 	}
  46. 	return QVariant();
  47.  
  48. }
  49.  
  50. bool CTableModel::setData(const QModelIndex &index, const QVariant & value, int role)
  51. {
  52. 	if (index.isValid() && role == Qt::EditRole)
  53. 	{
  54. 		items[index.row()][index.column()] = value.toString();
  55. 		emit dataChanged(index,index);
  56. 		return true;
  57. 	}
  58. 	return false;
  59. }
  60.  
  61. void CTableModel::setHorToolTipList(QStringList lista)
  62. {
  63.     horToolTip = lista;
  64. }
  65.  
  66. Qt::ItemFlags CTableModel::flags ( const QModelIndex & index ) const
  67. {
  68.  
  69. 	return Qt::ItemIsSelectable | Qt::ItemIsEnabled; 
  70. }
  71.  
  72. QVariant CTableModel::headerData(int section, Qt::Orientation orientation, int role) const
  73. {
  74. 	if (role != Qt::DisplayRole)
  75. 	{
  76.         if (orientation == Qt::Horizontal)
  77.         {	
  78.             if(role == Qt::ToolTipRole)
  79.             {
  80.                 return horToolTip[section];
  81.             }
  82.         }
  83. 		return QVariant();
  84. 	}
  85. 	if (role == Qt::DisplayRole)
  86. 	{
  87. 		if (orientation == Qt::Horizontal)
  88. 		{	
  89. 			return horHeaders.at(section);
  90. 		}
  91. 		else
  92. 		{
  93. 			return verHeaders.at(section);
  94. 		}
  95. 	}
  96. }
  97.  
  98.  
  99. bool CTableModel::setHeaderData(int section, Qt::Orientation orientation, const QVariant & value, int role)
  100. {
  101. 	if (role != Qt::EditRole)
  102. 		return false;
  103. 	if (orientation == Qt::Horizontal)
  104. 	{
  105. 		if (section > horHeaders.count()-1)
  106. 			horHeaders.append(value.toString());
  107. 		else
  108. 			horHeaders[section] = value.toString();
  109. 		emit headerDataChanged(orientation,section,section);
  110. 		return true;
  111. 	}
  112. 	else
  113. 	{
  114. 		if (section > verHeaders.count()-1)
  115. 			verHeaders.append(value.toString());
  116. 		else
  117. 			verHeaders[section] = value.toString();
  118. 		emit headerDataChanged(orientation,section,section);
  119. 		return true;		
  120. 	}
  121.  
  122. }
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I set the numbers of rows with setRowCount and the first time it works fine. But when I try to change it again, it doesn't work anymore. It weird because when I call model->rowCount(), the result is ok, but the view doesn't update the numbers of row.

Thanks a lot.
Regards.