[vtkusers] growing RAM memory

[chasank]

My suggestion is, 
 if you do not need more than one renderer and RenderWindow
 - Define them in a global scope,
 - And before each call to the widgetInicialization method, set them to the
NULL
 - in widgetInicialization method, Re-create them, set the values
 - Lastly update your widget object.

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