[vtkusers] Updating a windows form component with its handle outside of main UI thread

[chasank]

I'm sending the Handle of a PictureBox component to my VolumeRender method,
VolumeRender method binds the PictureBox component with
vtkWin32OpenGLRenderWindow , processes the pipeline and update the
renderWindow. Okay, this process is done outside of UI thread as I wanted,
but the problem is, as soon as volume rendering thread is out of scope, UI
thread I don't know why but it frees the pictureBox component. Here are the
codes;

private: System::Void volumeRenderButton_Click(System::Object^  sender,
System::EventArgs^  e) 
{
    volumeRenderThread = gcnew System::Threading::Thread(
        gcnew System::Threading::ThreadStart(this, &Form1::volumeRender));
        volumeRenderThread->Start(threeDPictureBox->Handle);
}

private: void volumeRender( System::Object ^obj )
{               
     IntPtr ^ptr = (IntPtr ^) obj;
     dicom->VolumeRender((HWND)(ptr->ToPointer()), vrSettings);     
}

void Dicom::VolumeRender(HWND pictureBoxHandle, VRsettings *settings )
{
    renderer = vtkSmartPointer < vtkRenderer > :: New();
    renderWindow = vtkSmartPointer < vtkWin32OpenGLRenderWindow > :: New();
    renderWindow->AddRenderer(renderer);
    renderWindow->SetParentId(pictureBoxHandle);
    renderWindow->SetSize(settings->width, settings->height);
    renderWindow->Initialize();

    iren = vtkSmartPointer < vtkWin32RenderWindowInteractor > :: New();
    iren->SetRenderWindow(renderWindow);

    /* Volume Render Pipeline 
    ...
    ...
    */

    renderWindow->Render();
    iren->Initialize();
}

When debugging the code, after the execution renderWindow->Render()
statement, in the main form, rendered image is seen on pictureBox Component,
but after the volumeRender thread is out of scope, threeDPictureBox is
somehow freed. I've asked same question on 
http://stackoverflow.com/questions/6035141/updating-a-windows-form-component-with-its-handle-outside-of-main-ui-thread
stackoverflow  I'm not sure if it is VTK related or .NET related. Anyone can
help me? Thanks


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