先定义一个Panel。好让下面的演示：

using System.Windows.Controls;using System.Windows;namespace Class3Samples{    public class CyclePanel : Panel    {        protected override System.Windows.Size ArrangeOverride(System.Windows.Size finalSize)        {            int count = this.Children.Count;            Point center = new Point(finalSize.Width / 2, finalSize.Height / 2);            for (int i = 0; i < count; i++)            {                Rect rect = new Rect();                switch (i % 4)                {                    case 0:                        rect = new Rect(center.X - 15 - (i / 4 + 1) * 50,                                         center.Y - 10,                                        30, 20);                        break;                    case 1:                        rect = new Rect(center.X - 15,                                        center.Y - 10 - (i / 4 + 1) * 50,                                        30, 20);                        break;                    case 2:                        rect = new Rect(center.X - 15 + (i / 4 + 1) * 50,                                        center.Y - 10,                                        30, 20);                        break;                    case 3:                        rect = new Rect(center.X - 15,                                        center.Y - 10 + (i / 4 + 1) * 50,                                        30, 20);                        break;                    default:                        break;                }                this.Children[i].Arrange(rect);            }            return base.ArrangeOverride(finalSize);        }        protected override Size MeasureOverride(Size availableSize)        {            foreach (UIElement child in Children)            {                child.Measure(new Size(availableSize.Width, availableSize.Height));            }            return base.MeasureOverride(availableSize);        }    }}

 

前台XAML：

 

在blend中的设计图：

Template 具体参见上一个日记。