You missed a comma before the 14 on the red and cancel buttons, along with in several other places.


Here is the fix:
Code:
MyDB DIALOG 18, 18, 142, 92
CAPTION "Test Dialog Box"
STYLE DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU
{
      DEFPUSHBUTTON "Red", IDD_RED, 32, 40, 30, 14,
                    WS_CHILD | WS_VISIBLE | WS_TABTOP //error line
      PUSHBUTTON "Green", IDD_GREEN, 74, 40, 30, 14,
                 WS_CHILD | WS_VISIBLE | WS_TABTOP
      PUSHBUTTON "Cancel", IDC_CANCEL, 52, 65, 37,14,
                 WS_CHILD | WS_VISIBLE | WS_TABTOP
}