Adding buttons dynamically in stacklayout

I would like to add a button dynamically in StackLayout when "add" button is clicked. I wrote stacklayoutname.children.add(button), it does not giving me the thing i am looking for.

In xaml:

<StackLayout x:Name="layout">
    <Button Text="add" Clicked="Addbutton"/>
</StackLayout>

In code:

private void Addbutton(object sender, EventArgs e)
{           
     var layout = new StackLayout();
     var btn = new Button { Text = "New button", FontSize = 30, TranslationY = 30 };
     this.Content = layout;
     layout.Children.Add(btn);
}

It is giving only new button and add button is disappearing, but I want whenever we click on add button it should give number of new button equal to the number of clicks on add button.