ICommand in Silverlight

let's see an instance that is easily and  can run well

  public class OpenChildWindowCommand : ICommand
    {
        /// <summary>
        /// 当出现影响是否应执行该命令的更改时发生。
        /// </summary>
        public event EventHandler CanExecuteChanged;
        /// <summary>
        /// 定义用于确定此命令是否可以在其当前状态下执行的方法。
        /// </summary>
        /// <param name="para"></param>
        /// <returns></returns>
        public bool CanExecute(object para)
        {
            if (para != null)
            {
                CanExecuteChanged(para, new EventArgs());
            }
            return true;
            //return false;
        }
        /// <summary>
        /// 定义在调用此命令时调用的方法。
        /// </summary>
        /// <param name="para"></param>
        public void Execute(object para)
        {
            MessageBox.Show("afdafd");

        }
 
    }

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