This is a great question and one that developers new to DevForce often ask.
Your problem is that you are binding to properties of a related object. It's true that you have done nothing to make these properties readonly, but DevForce makes access to these properties readonly by default - for the good reason that it is unusual to want to change the value of a related object through an interface looking at the original object. Thus, while looking at an Employee, we could look at her address, but we would typically change her address by popping up a dialog for that purpose or, perhaps, reserving real estate on the screen for that purpose.
In addition, if you make a related property editable, it can be confusing what the edit means. For example, let us say that an employee's manager's name is "Nancy Davolio" and a user changes it to "Nancy Smith". Does the employee have a new manager, or has Nancy's last name changed because she married Bob Smith.
If you really insist on editing a related poperty, you can set the editability of the control to "Optional". This works, but before you go ahead and do this, ask yourself whether this is the best way to edit this related property.
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