In the RC resource file if the dialog has this style similar to this it will be fixed size:
IDD_DIALOG_DIALOG DIALOGEX 0, 0, 320, 201
STYLE DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU
If the dialog has this style it will be sizeable:
IDD_DIALOG_DIALOG DIALOGEX 0, 0, 320, 201
STYLE WS_POPUP | WS_VISIBLE | WS_CAPTION | WS_SYSMENU | WS_THICKFRAME
With these sizable frame options the dialog will be re-sizeable but you will still need to do a lot of work handling the WM_SIZE message to manage the sizing an positioning of the controls within the dialog.
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