Description of problem:
Domain-specific task should be grouped according to category in the eclipse BPMN2 diagram editor.

Version-Release number of selected component (if applicable):
JBDS 7.1.1
JBPM 6.0.2

How reproducible:
Create a domain-specific language with "category" option.

Steps to Reproduce:
1. Create the following domain-specific language.
--------
import org.drools.core.process.core.datatype.impl.type.StringDataType;
[
// the Notification work item
[
"name" : "Notification",
"parameters" : [
"Message" : new StringDataType(),
"From" : new StringDataType(),
"To" : new StringDataType(),
"Priority" : new StringDataType(),
],
"displayName" : "Notification",
"icon" : "icons/notification.gif",
"category" : "Category8"
]
]
--------

2. Check the Pallet.

Actual results:
category option is ignored and grouped in "Custom Tasks".

Expected results:
category option is grouped according to the "category" option.

Additional info: