As per this MSDN link,
根据这个MSDN链接，
There is no way to replace only part of the visual tree of a control; to change the visual tree of a control you must set the Template property of the control to its new and complete ControlTemplateThe
阅读背景：
在哪里可以找到默认的WPF控件模板?
来源：互联网
分享到：
