we have made a new .h and a new .cpp

like
Qt Code: 
  1. #ifndef TABLEIHALESARTNAMEDELEGATE_H
  2.  #define TABLEIHALESARTNAMEDELEGATE_H
  3.  
  4.  #include <QItemDelegate>
  5.  #include <QModelIndex>
  6.  #include <QObject>
  7.  #include <QSize>
  8.  #include <QDoubleSpinBox>
  9.  #include <QtGui>
  10.  
  11.  
  12.  class ComboBoxDelegate : public QItemDelegate
  13.  {
  14.      Q_OBJECT
  15.  
  16.  public:
  17.      ComboBoxDelegate(QObject *parent = 0);
  18.  
  19.      QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,
  20.                            const QModelIndex &index) const;
  21.  };
  22.  
  23.  #endif
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and made our .cpp

Qt Code: 
  1. #include <QtGui>
  2. #include "tableIhaleSartnameDelegate.h"
  3.  
  4.       QWidget *ComboBoxDelegate::createEditor(QWidget *parent,
  5.            const QStyleOptionViewItem &option,
  6.            const QModelIndex &index) const
  7.       {
  8.          if (index.column() == 0)
  9.          {
  10.             // 2nd column is being edited, return a QComboBox as an editor
  11.             QComboBox *editor = new QComboBox(parent);
  12.  
  13.             return editor;
  14.          }
  15.          return QItemDelegate::createEditor(parent, option, index);
  16.       }
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after that what we should do?