List and table controls -> listbox..is that what you are thinking of?
The listbox presents the user with a list of options, and you can set it to only accept one selection at a time...Adding new data to the list can not be done directly by the user but if you make e.g. a text control and a button you can programatically insert new objects described in the text box when the button is pressed...(see example).
If you need more than one column you have the multicolumn listbox. If you want the users to write new entries directly yu can use a table and read selected cells using it's selection start property to read what cell has been selected.
