Well, I found a better solution: There will be two new properties that relate to the Anchors:
These are calculated and set by the Designer when Anchors are set. They represent the distance from bottom right corner of the component to the parent's bottom right corner. This is used by the RTL to resize the child component properly when Anchors are used.
The great thing is that this makes handling Anchors a lot more simple and elegant. It will also work even if the form size happens to change while the form is being built.