Implementing a record list with Treeview

Now that we understand how to use the Treeview widget, it's time to implement a GUI that will allow us to browse the records in the CSV file and open them for editing. Let's take a moment to plan out what it is that we need to create:

• We want to lay out the CSV data in a table structure, similar to how it would look in a spreadsheet. This will be a flat table, not a hierarchy.
• Each table row will represent a record in the file. When a user double-clicks the row, or highlights it and presses Enter, we want the record form to open with the selected record.
• We don't really need to show every field in the table, since its purpose is merely to locate records for editing. Instead, we'll show only the rows that uniquely identify a record to the user. Namely, those are Date, Time, Lab, and Plot. We can also show the CSV row number.
• There isn't really a need to sort the data, so we won't implement...