How to display a popup window for sharing with FB.API Facebook

Question

I have a code which I use to share a screenshot on Facebook once the user clicks on my "share" UI button, (once he logged in to Facebook). It works well and it shares the image directly on Facebook, but I want to have before the standard Facebook popup window that would ask the user the approval to share (and also includes the Facebook's privacy settings -public/friends only/ private.

I can get this dialog when I use FB.ShareLink, but I need to share a screenshot so I use FB.API

Here is the code:

  public void FacebookLogin()
  {
   var permissions = new List<string>() { "publish_actions" };
   FB.LogInWithPublishPermissions(permissions);
  }
  public void FacebookShare()
  {
    var bytes = GameManager.instance.tex.EncodeToPNG();
    var wwwForm = new WWWForm();
    wwwForm.AddBinaryData("image", bytes, "InteractiveConsole.png");
    wwwForm.AddField("message", "I did a thing!  Did I do this right?");
    FB.API("me/photos",HttpMethod.POST, APICallback, wwwForm);
  }