The WM_NEXTDLGCTL message is sent to a dialog box procedure to set the keyboard focus to a different control in the dialog box.
WM_NEXTDLGCTL wCtlFocus = wParam; // identifies control for focus fHandle = (BOOL) LOWORD(lParam); // wParam handle flag
An application should return zero if it processes this message.
The effect of this message differs from that of the SetFocus function because WM_NEXTDLGCTL modifies the border around the control.
Do not use the SendMessage function to send a WM_NEXTDLGCTL message if your application will concurrently process other messages that set the focus. Use the PostMessage function instead.
PostMessage, SendMessage, SetFocus
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