An application sends the IMC_CLOSESTATUSWINDOW message to the IME window to hide the status window.
msg = (UINT) WM_IME_CONTROL;
wParam = (WPARAM) IMC_CLOSESTATUSWINDOW;
lParam = (LPARAM) 0;
Returns zero if successful, nonzero otherwise.
When the status window of IME is already hidden, this message does nothing. Although an application may send this message to the IME window, the application does not receive the corresponding IMN_CLOSESTATUSWINDOW message.