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This issue was created automatically from an original Mantis Issue. Further discussion may take place here.

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At the moment, widgets resize their handles after they are transformed in the scene. If the user zooms in/out, the widget handles become disproportionately big or small compared to the viewport. If vtk3DWidget::SizeHandles() was changed to a public method it could be used as a callback, observing the renderer's StartEvent, so that widget handles are always correctly sized. This could be implemented in C++ inside the widgets themselves or left to the developer to do within their application. If implemented, this would probably make the SizeHandles() calls inside the *ButtonUp callbacks redundant.