The next thing on our to-do list is to implement a context-sensitive command bar. While our navigation bar is a constant presence with the same buttons regardless of what the user is doing, the command bar will come and go and will contain different buttons depending on the context. For example, if the user is adding or editing a client, we will need a Save button to commit any changes to the database. However, if we are searching for a client, then saving makes no sense and a Find button is more relevant. While the techniques for creating our command bar are broadly similar to the navigation bar, the additional flexibility required poses more of a challenge.
To help us overcome these obstacles, we will implement commands. An additional ...
