Text Render Mode 3 inside pdeForm

Hello,

I' have a problem to set Render mode 3 to Text inside a pdeForm.

Here is my code:

PDETextGetTextState ((PDEText)pdeElement, kPDETextRun, m_run, &textStateTmp, sizeof(textState));
textStateTmp.renderMode = kPDETextInvisible;
PDETextRunSetTextState ((PDEText)pdeElement, m_run, &textStateTmp, sizeof(textState));
          
PDPageReleasePDEContent (pdPage, gExtensionID);
PDPageSetPDEContent(pdPage, gExtensionID);
PDPageNotifyContentsDidChange (pdPage);
PDEFormSetContent( (PDEForm)m_formElement, m_pageContent );

It usually works fine,

but It doesn't work with a TextElement inside a PDEForm element: text remains visible
The pdeForm is itself inside two Containers

The structure of my PDF  is:

Container

   Container

      pdeForm

Any suggestion?

Thanks