[vtkusers] modify a text in the renderer with the mose move event

[RimAY]

Dear All ,
Can someone give me an idea how can i change a text in the renderer with the
mouse move event.
I try with vtktextactor this is the part of my code:

Tactorx = vtkTextActor()
Tactorx.SetInput(cx)
Tactorx.SetDisplayPosition(70,170)
Tactorx.GetTextProperty().SetJustificationToCentered()
renderer.AddActor(Tactorx)
Tactorx.Modified() 

cx change its value with the mose move, i get the new value above the ancien
one, the result is an illegible text :(

Thanks a lot 

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