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Function Addresses in MFC Message Cards

Why are function addresses displayed on message cards created by the class wizard written with the class name explicitly mentioned?

For example:

ON_BN_CLICKED(IDC_CHECK1, &CMyDlg::OnClickedSomeButton)

instead:

 ON_BN_CLICKED(IDC_CHECK1, &OnClickedSomeButton)

or even:

 ON_BN_CLICKED(IDC_CHECK1, OnClickedSomeButton)

All three options compile correctly.

This is just curiosity.

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