[vtkusers] Release button event doesn't

[al.gry]

Hi all,

i'm implementing qt vtk application. The goal is to adjust window level
using mouse

ObserverWindowLevel *observeWindowLevel =
ObserverWindowLevel::New(m_pQVTKIren);
m_pQVTKIren->AddObserver(vtkCommand::RightButtonPressEvent,
observeWindowLevel);
m_pQVTKIren->AddObserver(vtkCommand::RightButtonReleaseEvent,
observeWindowLevel);
observeWindowLevel->Delete();

when i'm trying to catch vtkCommand::RightButtonReleaseEvent in my
Execute(vtkObject *caller, unsigned long eventId, void *callData) nothing
happens. It works perfectly for RightButtonPressEvent but for some reason
RightButtonReleaseEvent is not passed to Execute(...)

Any ideas?

-Al

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