为什么在父控件的控件期间修改控件的属性时,ViewState会丢失。渲染方法?

Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)
    If someCondition Then
        childControl.Enabled = false
    End If

    MyBase.Render(writer)
End Sub

• 
  
• 保存视图状态
• 渲染
  
• 页面_加载
  
• 保存视图状态