I installed both plugins in KSP. The structure of the window of Tac Life Support, which is shown in the VAB, is simpler than the window of Kerbal engineer redux. So I thought, it should be easier to find the lines I am looking for in the source code of Tac Life Support. I was wrong. Can you name the files, which contain the lines for the button in the VAB? The word "button" is used in so many files. I don't know, where to start.