Add @:style metadata to a public variable to convert it into a "style"
property.
@:style
public var backgroundSkin:DisplayObject = null;
The following requirements must be met when using @:style metadata:
- The variable must be 
public - The variable must not have a getter or setter.
 - The variable must be initialized with a default value.
 - The variable's type must be nullable. For instance, use 
Null<Float>orNull<Int>for numeric types. 
Available since 
1.0.0
.