In MFC, the contents of a dialog are initialized if they are

associated with their corresponding data members. This is

done through "UpdateData(FALSE)" function. The control data

is transferred to the data members through "UpdateData(TRUE)".

In WIN32, the dialog data in controls can be initialized

during WM_INITDIALOG call. The control data can be updated

to the dialog members using apppropriate "SendMessage"

functions.