FrameOf
BRect lastFrame = fIconView->FrameOf(maxIndex);
lastFrame = fWindow->WindowView()->FrameOf(maxIndex);
BRect FrameOf(int32 index) const;
BRect frame = fIconView->FrameOf(index);
BRect FrameOf(int32) const;
BRect rect = FrameOf(index);
BRect rect = FrameOf(index);