JDialog is shown as separate icon on the taskbar

FULL PRODUCT VERSION :
Java 7

ADDITIONAL OS VERSION INFORMATION :
We observed this in both Windows and Solaris

A DESCRIPTION OF THE PROBLEM :
Earlier till Java6 on opening a JDialog with parent as JFrame, it used to come inside the frame.
But with Java7 it gets the icon of its own in the taskbar. This is hindering as the taskbar is full of these icons, when the Frame has many dialogs open.

REGRESSION. Last worked in version 6u26

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1)Launch the FileChooserDemo that comes with the JAVA installation. (JAVA_HOME/demo/jfc/FileChooserDemo/FileChooserDemo.jar)

2) Click on the 'Show FileChooser' button to open the FileChooser Dialog.
2) Launch it with both Java6 and Java7 as well
3) We observe that in Java6 the Dialog is shown inside the 'FileChoserDemo', but in the Java7 it gets the icon for itself.



REPRODUCIBILITY :
This bug can be reproduced always.