Flex 4 [HostComponent] class xxx not found (AS code)

1.Custom Button

public class GrayButton extends spark.components.Button
…

2.Custom Button Skin

[HostComponent("GrayButton")]
public class GrayButtonSkin extends 
spark.components.supportClasses.Skin implements mx.core.IStateClient2{
…
return hostComponent.selectedColor;
…
}

Flex sdks 4.1.0.16076  compiler error：

[HostComponent] class GrayButton  not found

 

Solution:

1.Custom Button

 No change.

2.Custom Button Skin

[HostComponent("spark.components.Button")]
public class GrayButtonSkin extends 
spark.components.supportClasses.Skin implements mx.core.IStateClient2{
…
return GrayButton( hostComponent).selectedColor;
…
}