As LittleStain said above
[quote:2lrx5otk]Textbox-object is meant for entering text, text-object is meant for displaying text..
If you want it to function like textarea then you are going to have to pull some rabbits out of your sleeve as you are making it do what it isn't intended to do.
The issue is the scrollbar, if you want to put a up down button you can move the text up and down using an array. Check the multiplayer chat box for source.
But the easiest is to use the TextBox Object and textarea as this is what is is ment for.