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How to change the text of CExtGridCellCheckBox cell when the check state is changes

You should override the CExtGridWnd::OnGridCellSetCheck() virtual method which has a reference to the cell object and its coordinates in the parameters. You can change cell’s text using the CExtGridCell::TextSet() method.

I have derived a class named CUserGrid from CExtGridWnd like "class CUserGrid : public CExtGridWnd " nd overrides the
OnGridCellSetCheck() function. But the overrided function is not being called when the state of the checkbx changes.

First of all please check the method declaration carefully:

      virtual void OnGridCellSetCheck(
            CExtGridCell & _cell,
            INT nCheck,
            LONG nColNo,
            LONG nRowNo,
            INT nColType,
            INT nRowType,
            const RECT & rcCellExtra,
            const RECT & rcCell
            );

Second, please let us know which cell classes are you using with the cell check box built-in inside .

If you are using v2.80, the method signature should look like this:
    virtual void OnGridCellSetCheck(
        CExtGridCell & _cell,
        INT nCheck,
        LONG nColNo,
        LONG nRowNo,
        INT nColType,
        INT nRowType,
        const RECT & rcCellExtra,
        const RECT & rcCell
        );
If you are using some previous version, you should search for the proper signature in your ExtGridWnd.cpp file under ProfUIS source code.

I am using 2.70, the method signature obtained from ProUIS source code looks like
virtual void OnGridCellSetCheck(
        CExtGridCell & _cell,
        INT nCheck,
        LONG nColNo,
        LONG nRowNo,
        INT nColType,
        INT nRowType,
        const RECT & rcCellExtra,
        const RECT & rcCell
        );
and is not working

Would you send us your project so we can find out what is wrong?