Review request for JMC-5576: Alert dialog should use a sash.

[Deepa Avhad]

Hi all,

Please review the fix for,
Jira: https://bugs.openjdk.java.net/browse/JMC-5576
webrev: http://cr.openjdk.java.net/~ghb/davhad/5576/webrev.0/
RC :  "Trigger Alert" dialog, impossible to show all detail in table 
without scrolling.
Solution: Added Sashform, which provides the sash between table and the 
text area.
Test: Tested on Windows 10, MacOS  and yet to test on Linux.

Thanks,
Deepa