Development build #200606210200 of NetBeans 5.5
Windows XP, RC build #87 of JDK 1.6

Description:
============
User is allowed to create unlimited number of empty watches when debugger is
running. The expressions are identical [1] and useless [2]. The "New watch
expression" dialog should have some logic when "OK" button is enabled.

Steps to reproduce:
===================
1. Create new Java application project with main class.
2. Add some code to body of main() method e.g. return; and toggle breakpoint at
that line (CTRL+F8).
3. Debug main project (F5).
4. Once the breakpoint is hit press ALT+SHIFT+2 to open Watches view.
5. Right click the view area and invoke "New watch ..." action from popup menu.
6. Just press "OK" button and repeat the same again.
7. You will see that two empty watches show up with ">Encountered "<EOF>" at
line.." values.

Note: Please note that the same mess is possible via "Run|Evaluate
===== Expression..." menu item ("Watch" button).