EXAMPLE

If your boopsi gadget needs a pointer to a Screen structure supplied with the MYBOOPSI_Screen tag, you would have to specify 

BoopsiObject,
   RecessedFrame,
   ...
   MUIA_Boopsi_TagScreen, MYBOOPSI_Screen,
   ...
   MYBOOPSI_Screen, 0, /* will be filled later by MUI */
   ...
   GA_Left  , 0, /* needs to be there, will */
   GA_Top   , 0, /* be filled later by MUI  */
   GA_Width , 0,
   GA_Height, 0,

   End;