Do I have to delete the "Default" brush for OnCtlColor "hbr"

The default brush for "OnCtlColor" is called "hbr",  but it is not a global declaration of this when I try to delete it in the "OnDestroy" function it is not usable.

Should I remove the default declaration of the brush and make it I can delete it via OnDestroy? Do I have to worry about it?

Any comments are appreciated. Thanks.
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If that brush is contained in a global object, its destructor will take care about that when the program terminates. But, since your Q is quite broad, that is just an assumption that might not be too off.
ObCtlColor usually looks like this:

HBRUSH CMyDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
   HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);

   // some stuff

   return hbr;

You don't need to release hbr. It is not created in your code, and you are not responsible for releasing it. If you don't call CDialog::OnCtlColor and return your own brush, you are responsible to release it.

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