>Dear Cetin
>
>Does my client need MsChart installed? Is it free? How to installed it?
>
>TIA.

Teo,
It comes with VS SP4. Mschrt20.ocx. You can distribute it. To check if you already have it either try below code :

oForm=createobject('myForm')
oForm.Show
read events

Define CLASS myForm AS form
  Top = 0
  Left = 0
  Height = 574
  Width = 793
  DoCreate = .T.
  Caption = "Form1"
  Name = "Form1"

  Add OBJECT MSChart AS olecontrol WITH ;
    Top = 2, ;
    Left = 2, ;
    Height = 550, ;
    Width = 778, ;
    Name = "MsChart",;
    OleClass='MSChart20Lib.MSchart.2'
  Procedure queryunload
  Clear events
Endproc

Or from tools\options\controls\activex controls check 'Microsoft Chart Control 6.0 SP4 (OLEDB)' is there. If not you could also check if ocx is in system32 folder.
To add it to distribution in setup wizard check activex controls and mark MS Chart control.
Cetin