Can I set popup content in text annotations?

I use the 3.9RC1 version library.

I want to add text annotations and add pop-up content.
But, text annotations do not include pop-up content.
Below is the code I use.

bResult always returns false..

-code-
Page.AddAnnotEditbox (m_annot_rect, 15, 100, 100, fsize, 100);

Annotation annot = page.GetAnnot (page.GetAnnotCount () - 1);
Annot.SetPopupOpen (true);

Boolean bResult1 = annot.SetPopupSubject ( "Subject");
Boolean bResult2 = annot.SetPopupText ( "Text");


help me!!

Can be used only with Page.AddAnnotText or Page.AddAnnotPopup, that's why it's not working with Page.AddAnnotEditbox.
For example, check PDFLayoutView.PDFEditAnnot

With Page.AddAnnotEditbox, you can use Annotation.SetEditText
For example, check PDFLayoutView.onEditAnnot