Center anchor point for a collapsed Pre-comp

Hi, 

I have a problem with a comp that contains a container shape and a pre-comp with text in it after collapsing the TEXT Pre-comp.

In my main comp, I want to keep the TEXT layer in the center whenever I change the text in the text layer.

I can use an expression for that but then it will count the real center, not the center after collapsing the comp?!

//The text in the text comp can not be centered because I edit each part alone. 216 is right-aligned text and 90 i left-aligned.