Noob Question - Control Group and TCs

If I queue a TC to build, add it to my TC control group, and wait for it to build, it seems to automatically remove itself from the control group when the building finishes... Is this normal or am I doing something wrong?

I also don't seem to be able to set a TC rally point until it completes construction. Does everyone else have this happen? I'd like to do more pre-building construction, but seems like the game doesn't allow it... Please let me know.

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Thanks,

Tyler