MyPanel.cs

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using Windows.Foundation;using Windows.UI.Xaml.Controls;namespace App1{    public class MyPanel : Panel    {        protected override Size MeasureOverride(Size availableSize)        {            if (Children.Count > 0)            {                double yy = 0d;                double ww = 0d;                foreach (var u in Children)                {                    u.Measure(availableSize);                    Size dssize = u.DesiredSize;                    yy += dssize.Height;                    ww = dssize.Width > ww ? dssize.Width : ww;                }                return new Size(ww, yy);            }            return availableSize;        }        protected override Size ArrangeOverride(Size finalSize)        {            double y = 0d;            foreach (var u in Children)            {                u.Arrange(new Rect(0d, y, u.DesiredSize.Width, u.DesiredSize.Height));                y += u.DesiredSize.Height;            }            return finalSize;        }    }}