[vtkusers] How to reassign an actor's mapper?

[hp.shen]

Hi, all
 
I created an actor using vtkLODActor, whose mapper is a
vtkPolyDataMapper.Then I created a vtkDataSetMapper, and I want to 
reassign the actor's mapper in an interactive way. I created a proc :
Proc changemapper {} {
    actor SetMapper datasetmapper
}
When running the script, I pressed 'U'key and recalled the proc
'changemapper'.After refreshing the window I found it took effect.
But, after closing the window an error message showed up,said:
---------
Assertion failed!
.
Expression:this->LeakedComponents.empty()
.
---------
What's wrong?Is it possible to reassign an actor's mapper?
 
Peace
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