[vtkusers] VTK + Java adding actors

[Brian Henz]

I have VTK and Java working on SGI and Linux but an having some trouble with 
the following.  I create a vtkPanel and then add actors to it which are 
displayed and I can interact with them.  But I can only interact with the 
actors added in the same function where new vtkPanel was called.  If I 
create the Panel and pack it, and then add actors when a button is pushed 
they are not viewable or interactive but they do exist because I can do 
getRenderer().GetActors() and then list the actors.

When I try to interact with the actors I get
Exception occurred during event dispatching:
java.lang.NullPointerException
  at vtk.vtkPanel.mouseDragged(vtkPanel.java:211, Compiled Code)
  at java.awt.Component.processMouseMotionEvent(Component.java:3204, 
Compiled Code)
  at java.awt.Component.processEvent(Component.java:3003, Compiled Code)
  at java.awt.Component.dispatchEventImpl(Component.java:2394, Compiled 
Code)
  at java.awt.Component.dispatchEvent(Component.java:2307, Compiled Code)
  at java.awt.EventQueue.dispatchEvent(EventQueue.java:287, Compiled Code)
  at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:101, 
Compiled Code)
  at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:92, 
Compiled Code)
  at java.awt.EventDispatchThread.run(EventDispatchThread.java:83, Compiled 
Code)


Any ideas would be helpful.
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