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分享ShowWindow(SW_NORMAL);
// TODO: your action code here
BOOL CComboBoxExDlg::OnInitDialog()
{
CDialog::OnInitDialog();
//...
HWND hButton = ::GetDlgItem(m_hWnd,IDC_BUTTON4);
::PostMessage(hButton,WM_LBUTTONDOWN,MK_LBUTTON,NULL);
::PostMessage(hButton,WM_LBUTTONUP,MK_LBUTTON,NULL);
}