GUI scroll list bar automatically expands?

I didn’t have much experience in Unity GUI.

My question is,

  1. If I set my inventory window as scroll list bar and has now 2 rows,

→ this can be show without scroll function.

(Question : Then automatically scroll bar disappear?)

  1. Later if I expands variable that contains inventory’s row to something like 10.

Then I need scroll bar to scroll down.

(Question : Then automatically scroll bar appear?)

A scrollview will automatically hide the scrollbars when the content is no larger than the view rectangle. However, you can override this behaviour using the alwaysShowHorizontal and alwaysShowVertical parameters.