MailBox Frame

[Oldhroft]

Hello to everyone.

I'm trying to get involved with wow API and LUA. And I'm struggling to get documentation.

For example I know that for every frame you can run script to click any action on that frame.
Example: /run AuctionHouseFrame.ItemSellFrame.PostButton:Click()

I've search everywhere and I can't find where this docs lives.

Atm I looking for the same /run script to click Inbox/Send Mail buttons for MailFrame.

But I would really appropriate if some one can give me a link or method how to find all the function for all the frames. Also if you have a good beginner friendly channel/reading for wow addons developers will appreciate as well.

Update:

I've found a tool - /fstack
https://wowpedia.fandom.com/wiki/MACRO_framestack

/run MailFrameTab2:Click() working perfect