Answer Posted / ps

1. make a control variable of button with the Cbutton class;
2. where you want to change the text then call only setwindowtext();

in header file;
Cbutton mButton;.
IN RESOURCE.H...
#DEFINE BUTTON_ID 249;// CONTROLL ID NUMBER 249 ANY YOU WNT OR SYSTEM GENRATED.
in cpp file.
'''''''mesage map
ABC::DoDataExchange(CDataExchange* pDX)
{
CDialogEx::DoDataExchange(pDX);
DDX_Control(pDX, BUTTON_ID, mButton);
}
BOOL ABC::OnInitDialog()
{
// IF USER CHANGE ON INIT METHOD THEN CAN DO OR CHANGE IN ANY METHOD WITH THE SAME CLASS
mButton.setwindowText(_T"hello");


}

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