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Specifies whether CWnd is enabled for mouse and keyboard input.

BOOL IsWindowEnabled( ) const;

Nonzero if CWnd is enabled; otherwise 0.

//change the background color of an edit control on the dialog
HBRUSH CMyDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
   HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);

   if (pWnd->GetDlgCtrlID() == IDC_MYEDIT)
      if (pWnd->IsWindowEnabled())
         // Red brush for the background...
         pDC->SetBkColor(RGB(255, 0, 0));
         // m_pRedBrush is the CBrush object initialized with a red brush  
         // using CreateSolidBrush 
         // Blue brush for the background...
         pDC->SetBkColor(RGB(0, 0, 255));
         // m_pBlueBrush is the CBrush object initialized with a blue  
         // brush using CreateSolidBrush 
         return (HBRUSH)m_BlueBrush.GetSafeHandle();

   return hbr;

Header: afxwin.h