PROBLEM DESCRIPTION
===================
Customer reports an issue with Java 7u25 and 7u45, where once the focus
leaves a scene, the scene no longer updates the data when the focus returns
to the scene.

Issue Clarification
===================
Open a new JavaFX project in NetBeans using the attached testcase,
TableRowValueGcBug.java.

Part A -- Run the project to open a GUI named "Table Row Value Bug". The
upper left corner of the GUI says "Step 1". Click "Click Me!" button several
times. The data in the text box and the table in the scene updates correctly
every time. This is the expected behaviour.

Part B

1. Click "Next" button once. The table dissappears from the GUI.

2. Click "Click Me!" a few times. The text box updates, as expected. Click
"Next". "Step 3" shows in the upper left corner and the table reappears in
the GUI. The "Next" button is dimmed.

3. Click "Click Me!". The text box updates while the table remains unchanged.
This is the problem raised by the customer.

The customer suspects the listeners are being garbage collected or if they
just get deregistered during step 2, but nothing seems to be listening
anymore once you get to step 3.

WORKAROUND
==========
The customer says the "best" workaround is to remove and re-add all of the items in the table when the table is re-added to the Scene. This solves the problem, but it's very annoying for a workaround, and definitely inefficient.