[vtkusers] vtkPropPicker can't be used in vtkAssembly, need help!

[derong]

Hi, All

Did anyone face the trouble to add pick function in vtkAssembly?

I try to build an application to build some assembly objects, and when I use mouse to pick one object
inside the assembly , the box of this object will be displayed.

I choose vtkPropPicker as my picker in my application because it is fast.
But when i try it with MFC programming, it turns out crash unpredictable.

The error message is like this:  Invalid Address specified to RtlValidateHeap( 01A60000, 032E5FF0 )
I tried to track this bug in my programs, I found one break point at:  
                                     cullPicker->Delete(); (in vtkRenderer.cxx)
 one break point follows this is at:
                                   this->Actors->Delete(); (in vtkPicker.cxx). 
The final break point is at vtkCollection method DeleteElement(vtkCollectionElement *e):
                                     delete e;
because e's address is 0x032e6010, it beyonds ( 01A60000, 032E5FF0 ). 

I also found some suspicous codes in vtkPicker.cxx
In the method: int vtkPicker::Pick(float selectionX, float selectionY, float selectionZ, vtkRenderer *renderer) 
There is a statement: this->Prop3Ds->AddItem((vtkProp3D *)prop);
If prop is an assembly, one same assembly can be added several times after I picked something in assembly. 
Is that reasonable?

By the way, I have tested my application without any assembly. It works fine.

I feel  frustrating with this bug in my application. Any hint will be helpful.

Regards.

Derong 
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