[NX-412] Fix quips being shown on all grids after they are used for a tree node

https://issues.sonatype.org/browse/NX-412

Used the fix from http://www.sencha.com/forum/showthread.php?264228-Unwanted-data-qtip-attributes-on-gridpanel-rows&p=968430&viewfull=1#post968430
Opened a ticked with Sencha.