Code for "Apply to First Indicator Data"

Few (such a RSI or Standard Deviation) indicators  that come with MT4 installation has the option of choosing "Apply to First Indicator Data". Is there a way to look at the code of these indicators. I want to add this option to other custom indicators that I have. Thanks.
Hi, This is my question too. "Harapa", have you found any answer within the past year?
Use this and you would have found this