Text Boxes Selection and Scroll Bars

[tum_twish]

1.
How do I select a line that is placed in a selected number (like a search). For example, if the user enters a number, the program will search for that number, and then highlight that number in a given list. This list is in a text box.

2.
I have made a set of text boxes, however, some of them have disabled scroll bars (grey colour, range of text not large enough). How do I remove these disabled scroll bars without making the text box smaller?