I have a CIconCheckBox class which isderived from CXTPButton class.  This function for setting ImageManager:

void CIconCheckBox::SetImageManager(CXTPImageManager*pImageManager)

{

    if (pImageManager&& m_pMarkupContext)

    {

       m_pMarkupContext->SetImageManager(pImageManager);

       CMDTARGET_ADDREF(pImageManager);

    }

    else

        ASSERT(0);

}

This checkbox is then initialized in a dialogas follow

CMyDialog::OnInitDialog()

{

    BOOL result =CXTPPropertyPage::OnInitDialog();

    // m_imageManager &m_checkbox are members of CMyDialog

   m_imageManager.SetImageList(IDB_IMAGELIST, 16);

    m_checkbox.SubclassDlgItem(IDC_CHECKBOXID,this);

   m_checkbox.SetImageManager(&m_imageManager);

    m_checkbox.SetImage(0);

}

This code works well in v16.2.4 &Visual Studio 2012. However, after being upgraded to v17.3.0 & VisualStudio 2015, exception always occurs in CXTPImageManagerIconHandle::GetBitmap()because of hBitmap=null and m_pRInfo=null.

HBITMAPCXTPImageManagerIconHandle::GetBitmap() const

{

    ASSERT(IsAlpha());

    if (m_hBitmap)

        returnm_hBitmap;

    if (m_pRInfo &&m_pRInfo->pResource && m_pRInfo->pResource->m_hbmpImage)

        returnm_pRInfo->pResource->m_hbmpImage;

    ASSERT(FALSE);

    return NULL;

}

// CallStack for reference

ToolkitPro1730vc140UD.dll!CXTPImageManagerIconHandle::GetBitmap()Line 1320           C++

ToolkitPro1730vc140UD.dll!CXTPMarkupGdiPlusDeviceContext::IconToGdiplusBitmap(CXTPImageManagerIcon* pIcon) Line 781   C++

ToolkitPro1730vc140UD.dll!CXTPMarkupGdiPlusDeviceContext::DrawImage(CXTPImageManagerIcon* pIcon, CRect rc) Line 799     C++

ToolkitPro1730vc140UD.dll!CXTPMarkupGdiPlusDeviceContext::DrawImage(CXTPMarkupDeviceDependentImage* pImage, CRect rc) Line872              C++

ToolkitPro1730vc140UD.dll!CXTPMarkupDrawingContext::DrawImage(CXTPMarkupDeviceDependentImage* pImage, CRect rc) Line 845        C++

ToolkitPro1730vc140UD.dll!CXTPMarkupImage::OnRender(CXTPMarkupDrawingContext* pDC) Line 230           C++

ToolkitPro1730vc140UD.dll!CXTPMarkupVisual::Render(CXTPMarkupDrawingContext* drawingContext) Line 878             C++

ToolkitPro1730vc140UD.dll!CXTPMarkupVisual::Render(CXTPMarkupDrawingContext* drawingContext) Line884             C++

ToolkitPro1730vc140UD.dll!XTPMarkupRenderElement(CXTPMarkupUIElement* pElement, HDC__ * hDC, const tagRECT * lpRect) Line 131  C++

ToolkitPro1730vc140UD.dll!CXTPButtonTheme::DrawButtonText(CDC* pDC, CXTPButton * pButton) Line 418   C++

ToolkitPro1730vc140UD.dll!CXTPButtonTheme::DrawButton(CDC* pDC, CXTPButton * pButton) Line119          C++

ToolkitPro1730vc140UD.dll!CXTPButton::DoDraw(CDC* pDC) Line396               C++

ToolkitPro1730vc140UD.dll!CXTPButton::OnDraw(CDC* pDC) Line382               C++

ToolkitPro1730vc140UD.dll!CXTPButton::OnPaint()Line349               C++