@Zeta,
myGrid and myOtherRectangle are siblings.
I found anchorItem in some other source where I took the inspiration from. I did not find it myself.

@coderus,
Thanks. I had tried something similar but that did not work either. Apparently you can only anchor to a parent or a sibling. myGrid is a siblibg, myGrid.rect1 is not.

Never mind, I think I figured it out. I need to refactor the code at a higher level. I could write more details when I get back to a PC.