Editor not focused in listview:Android

I have an editor control in my custom viewcell in listview. However when I focus on editor, keyboard doesnt come up. Is there something that I might be missing? Here is the code I use-

                           var notes=new Editor();
            notes.SetBinding(Editor.TextProperty,new Binding("DeliveryNotes",BindingMode.TwoWay));
            parentLayout.Children.Add (notes);