Lexis

I have wondered why there isn't any good Lexis-plot command in Stata? Most of them are very old and do not use new commands stsplit etc. Evhistplot, grlexis2 and stlexis are quite old and lack of many features. Clayton & Hills stlexis is interesting but for Stata 5! Does anybody know a good ado for Lexis. Why there not any in official st-commands?
I was just wondering...