title: iTextSharp 5.3.3:Insert PushbuttonField in PDF and SetAction
body: <p>I want to create PushButton in PDF-document and set Action (GoToLocalPage):     </p>
  
  <pre><code>PushButton:=New PushbuttonField(stamper.writer, New Rectangle(300, 300,330,330),"Text");
  PushButton.Image:=img;
  PushButton.ProportionalIcon:=True;
  PushButton.Layout:=PushbuttonField.LAYOUT_ICON_ONLY;
  PushButton.Field.Action:=PdfAction.GotoLocalPage(2, New PdfDestination(PdfDestination.FIT), stamper.Writer);
  stamper.AddAnnotation(PushButton.Field,5);
  </code></pre>
  
  <p>As a result, the Action is not working. What am I doing wrong?</p>
  
  <p>In all the examples written: PushButton.GetFields().SetAction(...). But in iTextSharp 5.3.3 method GetFields does not exist...</p>
  
  <p>I tried: </p>
  
  <pre><code>Action:=PdfAction.GotoLocalPage(2, New PdfDestination(PdfDestination.FIT), stamper.Writer);
  
  PushButton.Field.SetAdditionalActions(iTextSharp.text.pdf.PdfName.D, Action);
  </code></pre>
  
  <p>But it's does not working too..</p>