ControlExample.xaml.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Markup;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

// The User Control item template is documented at http://go.microsoft.com/fwlink/?LinkId=234236

namespace AppUIBasics.ControlPages
{
    [ContentProperty(Name="Example")]
    public sealed partial class ControlExample : UserControl
    {
        public static readonly DependencyProperty HeaderTextProperty = DependencyProperty.Register("HeaderText", typeof(string), typeof(ControlExample), new PropertyMetadata(null));
        public string HeaderText
        {
            get { return (string)GetValue(HeaderTextProperty); }
            set { SetValue(HeaderTextProperty, value); }
        }

        public static readonly DependencyProperty ExampleProperty = DependencyProperty.Register("Example", typeof(object), typeof(ControlExample), new PropertyMetadata(null));
        public object Example
        {
            get { return GetValue(ExampleProperty); }
            set { SetValue(ExampleProperty, value); }
        }

        public static readonly DependencyProperty XamlProperty = DependencyProperty.Register("Xaml", typeof(object), typeof(ControlExample), new PropertyMetadata(null));
        public object Xaml
        {
            get { return GetValue(XamlProperty); }
            set
            {
                if (value != null)
                    XamlBorder.Visibility = Visibility.Visible;
                SetValue(XamlProperty, value);
            }
        }

        public static readonly DependencyProperty ExampleHeightProperty = DependencyProperty.Register("ExampleHeight", typeof(GridLength), typeof(ControlExample), new PropertyMetadata(new GridLength(1, GridUnitType.Star)));
        public GridLength ExampleHeight
        {
            get { return (GridLength)GetValue(ExampleHeightProperty); }
            set { SetValue(ExampleHeightProperty, value); }
        }

        public new static readonly DependencyProperty HorizontalContentAlignmentProperty = DependencyProperty.Register("HorizontalContentAlignment", typeof(HorizontalAlignment), typeof(ControlExample), new PropertyMetadata(HorizontalAlignment.Left));
        public new HorizontalAlignment HorizontalContentAlignment
        {
            get { return (HorizontalAlignment)GetValue(HorizontalContentAlignmentProperty); }
            set { SetValue(HorizontalContentAlignmentProperty, value); }
        }

        public ControlExample()
        {
            this.InitializeComponent();

            if (Xaml == null)
            {
                XamlBorder.Visibility = Visibility.Collapsed;
            }
        }
    }
}