mvvm 事件绑定

[hwy6384309]

<TextBox Text="{Binding fy_daofuText}" MaxLength="4" Width="50" Height="22" Margin="2,0,0,0" Padding="0,0,0,0" >
<i:Interaction.Triggers>
<i:EventTrigger EventName="TextChanged">
<ioc:InvokeCommandAction Command="{Binding fy_daofu_Changed}" />
</i:EventTrigger>
</i:Interaction.Triggers>
</TextBox>

怎么在viewmodel里 动态创建TextBox的时候生成TextChanged事件

[郑州高新区WPF小王子]

  this.myTextbox.TextChanged += new TextChangedEventHandler(myTextbox_TextChanged);
        void myTextbox_TextChanged(object sender, TextChangedEventArgs e)
        {
           // TODO:
        }