GUI abilities

hi. i am newbiein haiuku, in spite of my profile registration.
When i launched haiku first time, i was little confused.
1.if i am right, the button, comobos, and other gui object does not have a “Hint” element (additional text area,1-2 strings, displayed,when you wait for a long near the object)? Please,where i can find info about this option in haiku?
2.I did not found a minimize button on dialog and forms…where i can read about “why do they did this?”