Rule 2 of 8 · Chapter I — App Architecture
Name controls before you wire them.
Why this rule exists
Formulas reference controls by name, and renaming later touches every formula. A screen full of Gallery3 and Label17 becomes unreviewable and unfixable within a month.
In practice
The moment a control gets a formula, it gets a real name: galOrders, lblStatus, btnSubmit. Prefix-style is less important than doing it immediately.