An application sends a DM_SETDEFID message to change the identifier of the default push button for a dialog box.
DM_SETDEFID wParam = idControl; // identifier of new default push button
This message is processed by the DefDlgProc function. To set the default push button, the function can send WM_GETDLGCODE and BM_SETSTYLE messages to the given control and the current default push button.
Using the DM_SETDEFID message can result in more than one button appearing to have the default push button state. When Windows brings up a dialog, it draws the first push button in the dialog template with the default state border. Sending a DM_SETDEFID message to change the default button will not always remove the default state border from the first push button. In these cases, the application should send a BM_SETSTYLE message to change the first push button border style.
The return value is always TRUE.
BM_SETSTYLE, DefDlgProc, DM_GETDEFID, EM_SETLIMITTEXT, WM_GETDLGCODE
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