It may be thought by the Developers who did the DateField component that BackgroundColor property may not be required, or I don’t know their intention , but what if it is required for your App ?.
Even we [our projects] had this requirement in the beginning, when we were into projects, but I could not find time to do R&D. After I got in to the core part of the Framework and explored the classes and got the logic to implement this.
To tell frankly its simple but to get the logic you really need to explore the classes.
Will come back with explantion. The above image shows the NewDateField Component.