reg test TranslucentShapedFrameTest fails to create non-opaque frame

Steps to reproduce:

1. run TranslucentShapedFrameTest
2. enable "Non Opaque Frame" check box
3. click "Create Frame" button

The test should open non-opaque AWT Frame but it doesn't and throws

Exception in thread "AWT-EventQueue-0" java.awt.IllegalComponentStateException: The frame is decorated
at java.awt.Frame.setBackground(Frame.java:986)
at TSFrame.createGui(TSFrame.java:260)
...