Working with Related Tables -- Part 2 n 161 Whenever Man- z TIP Scripts) where you leave a window (Manage Database, Specify Button, to make age you've just been looking around, unless you intended one or more changes, get in the habit of choosing the Cancel button. Many times I've watched users go to a window or dialog and make a change accidentally, only to have it become the new setting when they clicked OK. Of course, once it becomes a habit, you can just as easily forget to click OK when you really mean to make a change. External Data Source 9 FileMaker can now connect with a number of ODBC databases by pulling a table occurrence right into the relationships graph. Even though we'll discuss this in more detail in Chapter 26, "Working with External Data Sources," I want to tease you a little bit here. When you are in Manage Database on the Relationships tab and click the button to add a table, if you click the Data Source drop-down you'll see the list shown in Figure 7-14. It's the "Add ODBC Data Source" item that holds the power here. You first need to define a data source elsewhere in your system, as outlined briefly in Chapter 21, "Sharing Your Data with Other Part 2