Add native (android) controls in custom renderer

Currently I am trying to implement a custom renderer for android, which is supposed to display a pdf document.

For doing that I need to add some android controls from within the custom renderer and add them to the current view.
The issue is: The code runs through fine, but I still end up looking at a blank page.

Maybe someone can give me a hint on what I might be missing out so far?

Thanks a lot in advance!

Btw, here's my code so far:
`
protected override void OnElementChanged(ElementChangedEventArgs e)
{
base.OnElementChanged(e);
if (e.NewElement == null)
return;

        if (e.NewElement.BindingContext != null)
            model = e.NewElement.BindingContext as MediaViewModel;
        this.RemoveAllViews();
        try
        {
            OpenRenderer(this.Context, model);
        }
        catch (IOException ex)
        {
            ex.PrintStackTrace();
            Toast.MakeText(this.Context, "Error! " + ex.Message, ToastLength.Short).Show();
        }

        Droid.Widget.ScrollView scroller = new Droid.Widget.ScrollView(this.Context)
        {
            HorizontalScrollBarEnabled = false,
            LayoutParameters = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FillParent, ViewGroup.LayoutParams.FillParent)
        };

        this.AddView(scroller);
        pdfLayout = new LinearLayout(this.Context)
        {
            Orientation = Droid.Widget.Orientation.Vertical,
            LayoutParameters = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FillParent, ViewGroup.LayoutParams.WrapContent)
        };
        scroller.AddView(pdfLayout);
        Droid.Widget.ImageView imageview = new Droid.Widget.ImageView(this.Context)
        {
            LayoutParameters = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FillParent, ViewGroup.LayoutParams.WrapContent)
        };
        ShowPage(0, imageview);
        pdfLayout.AddView(imageview);

        if (mPdfRenderer.PageCount > 1)
        {
            Droid.Widget.ImageView imageview2 = new Droid.Widget.ImageView(this.Context)
            {
                LayoutParameters = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FillParent, ViewGroup.LayoutParams.WrapContent)
            };
            ShowPage(1, imageview2);
            pdfLayout.AddView(imageview2);
            lastPageAdded++;
        }
        this.Invalidate();
        this.RequestLayout();
    }

`