ScrollView inside StackLayout not visible.

I am using following code. I am executing the app in windows phone 8. In output screen I can see only titleLable(Label) and nextButton (Button). ScrollView is not visible nor any component inside it.

ContentPage.Content = new StackLayout
{
    Children = 
        {
            titleLabel,
            new ScrollView
            {
                Content = new StackLayout
                {                            
                    Children =
                    {
                        someEntry,
                        someEditor,
                        someLabel
                    },
                }
            },
             nextButton
        }
};