Text password app

[heartisall]

I was wondering if anyone is aware of an app that could lock your text messages only. I would prefer it to pop up and ask for a number pw when you touch the text button of HtcHome. I am aware that you can lock the whole phone but this can be very annoying, I think this app could benefit a lot of people. If there isn't one maybe someone with some programming skills could write one it doesn't seem like it would be a very tough thing to create. Any help would be great