This pointer wierdness

Viewport *RenderTarget::AddViewport(Camera *AttachedCamera, float X, float Y, float Width, float Height, int ZOrder)
    {
        // Make sure a viewport with this Z-Order doesn't already exist
        ViewportList::iterator iter = m_ViewportList.find(ZOrder);

        // Dump an error if it does exist
        if (iter != m_ViewportList.end())
        {
            // Build an error
            std::stringstream ErrorString;
            ErrorString << "RenderTarget::AddViewport() - Cannot add a new viewport. A viewport with a Z-Order of ";
            ErrorString << ZOrder;
            ErrorString << ", already exists.";

            throw std::runtime_error(ErrorString.str());
        }

        // Create a new viewport
        Viewport *VPort = new Viewport(AttachedCamera, this, X, Y, Width, Height, ZOrder); //<-- The Problem!!

        // Add the viewport to the viewport list
        m_ViewportList.insert(ViewportList::value_type(ZOrder, VPort));

        return VPort;
    }

Viewport::Viewport(Camera *AttachedCamera, RenderTarget *Target, float X, float Y, float Width, float Height, int ZOrder)
    {
        assert(AttachedCamera && "NULL Camera pointer. A viewport must have a valid camera.");
        assert(Target && "NULL RenderTarget pointer. A viewport must be attached to a valid render target.");

        m_AttachedCamera = AttachedCamera;
        m_Target         = Target;

        m_RelativeX      = X;
        m_RelativeY      = Y;
        m_RelativeWidth  = Width;
        m_RelativeHeight = Height;

        m_ZOrder         = ZOrder;

        m_ActualX        = 0;
        m_ActualY        = 0;
        m_ActualWidth    = 0;
        m_ActualHeight   = 0;

        m_ClearColor     = Color(0.0f, 0.0f, 0.0f, 0.0f);
        m_ClearEachFrame = false;

        UpdateDimensions();
    }