How to hide a button of mutilmedia in pdf file?

I had insert a vedio to pdf file first,and set status to invisible，then i used radaee SDK to open it ,but it visible。I found a method to hide it, www.radaeepdf.com/forum/search?query=set...7/2018&childforums=1 ,
my code is in follow:

public void HideAnnotatioin() {
int pageCount = m_doc.GetPageCount();
for (int i = 0; i < pageCount; i++) {
Page page = m_doc.GetPage(i);
page.ObjsStart();
int anncount = page.GetAnnotCount();
for (int j = 0; j < anncount; j++) {
Annotation annotation = page.GetAnnot(i);
if (annotation != null) {
annotation.SetHide(true);
}
}
m_layout.vRenderSync(m_layout.vGetPage(i));
page.Close();
}
}
but it doesn't work, it make me confused。

Hi,
first of all you have to change your code like this :
I suggest you to place this code just after the pdf opening, as example in the demo project you can put it in the onPostExecute() of OpenTask in PDFViewAct.