How to configure action icon by resource bundle

Hi.

I need configure action icon using my resourceBundle file (extends WTListResourceBundle).

Code example:

@RBEntry("my_img_folder/action_icon.png")

public static final String MY_ACTION_ICON = "myObjectType.myActionName.icon";

"my_img_folder" is located in codebase/netmarkets/images.

But i cann't see icon in action menu.

My resourceBundle file works, because if i specify any other icon from netmarkets/images, i can see it in action menu.

What am i doing wrong or maybe forgot to do?

Thanks.