Description of problem:
- The current "BPMN2 Diagram Editor" shipped for JBDS 7.x does not allow entering comma "," for adding multiple group id in "Group Id" property. It just allows "." instead. Although our documentation [1] clearly states that it is possible to provide multiple group id (separated by comma) in editors but the Eclipse based editor is not allowing it.

- Meanwhile, customers can use the older editor of "BPMN2 Process Editor" to input the multiple Group Id (separated by "," comma) in the "GroupId" property of the User Task . In fact the customer can also use the "jBPM Web Designer" too from Business Central.

[1] https://access.redhat.com/documentation/en-US/Red_Hat_JBoss_BPM_Suite/6.0/html/User_Guide/sect-User_Task.html

Version-Release number of selected component (if applicable):
- JBDS 7.1.1
- BPMN2 Modeler - Diagram Editor - 1.0.2.201402102317

How reproducible:
- Always

Steps to Reproduce:
1. Create a simple BPMN2 Process in JBDS 7.1.1 using "BPMN2 Diagram Editor" 
2. Create a User Task and try to edit the property "Group Id" for the task
3. Now, try to add multiple group id there separated by comma

Actual results:
- Editor does not allow entering comma "," in the property "Group Id" 

Expected results:
- Editor should allow entering comma "," in the property "Group Id" 

Additional info:
- NA