How to change a private atribute of class CL_GUI_ALV_GRID

I would like to influence attribute"M_DISABLE_SAVE" in this class.
Is it possible? If so, how can I do it.
Thanks.

If you don't want the user to be able to save a layout of the grid, then make sure to pass "SPACE" to the I_SAVE parameter of the SET_TABLE_FOR_FIRST_DISPLAY method of the class CL_GUI_ALV_GRID.
CALL METHOD ALV_GRID->SET_TABLE_FOR_FIRST_DISPLAY
 EXPORTING
 I_SAVE = space "<--- do not allow to save layout
 CHANGING
 IT_OUTTAB = I_ALV[]
Regards,
Rich Heilman

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dear friends:
i want to change the value of Valuation class in the material master .but system warning info occurs .
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Message no. M3 368
Diagnosis
You wanted to change the valuation class. However, this is not possible because one or more of the following already exist for the material:
Valuated stocks in the current period or in the previous period
Open purchase orders or delivery schedule lines
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Dear Sandesh,
Refer to:
[Changing The Valuation Class|http://www.sap-img.com/materials/changing-the-valuation%20class.htm]
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[Changing Valuation Class|http://masteryen.com/sap/?p=98]
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Note: Key-points to remember, before changing the Valuation Class -
1. All the stocks are zero and
2. There is no pending orders as well?

How to change a private atribute of class CL_GUI_ALV_GRID

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