If your boopsi gadget needs a pointer to a DrawInfo structure supplied with the MYBOOPSI_DrawInfo tag, you would have to specify
BoopsiObject, RecessedFrame, ... MUIA_Boopsi_TagDrawInfo, MYBOOPSI_DrawInfo, ... MYBOOPSI_DrawInfo, 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;