HBRUSH data member initialization in OnInitDialog()

[Dennis Tyberend]

I have instructions to declare data members of type HBRUSH and then initialize them in OnInitDialog(). Then I should use these data members in HBRUSH CMyDialog::OnCtlColor(...) so I can change the background color and control colors for my dialog. My questions is: What does it mean to initialize the HBRUSH data members in OnInitDialog()? Thanks in advance.