PrettyPrintable (flex-messaging-common 4.7.0 API)

```
public interface PrettyPrintable
```
Allows an Object to customize how it is pretty printed in logging/debugging output.

Methods
Modifier and Type	Method and Description
`String`	`toStringCustomProperty(String name)`
`String`	`toStringHeader()`

String toStringCustomProperty(String name)

Interface PrettyPrintable