How to create a drop-down menu in OpenOffice.org

There are two easy ways how to create a drop-down menu in OpenOffice.org calc (this worked already in version 2.x and has been tested up to 3.2.1).

The difference between the two ways is the source of the selection entries.

Selection entries are to be entered manually

Go to a cell where the drop-down menu should appear.
Do Data -> Validity....
In the popup window choose the Criteria tab (usually selected by default).

In the Allow menu choose List.

It will show a new textfield called Entries where you enter the choices for your drop-down menu line by line.

Selection entries come from a cell range on the spreadsheet

Go to a cell where the drop-down menu should appear.
Do Data -> Validity....
In the popup window choose the Criteria tab (usually selected by default).

In the Allow menu choose Cell range.

It will show a new textfield called Source where you enter the choices for your drop-down menu as a cell range e.g. B2:B10.
Note: the cell range needs to be entered manually and can't be selected on the spreadsheet.