提交按钮
<button click="onclick" command=｛binding passcommand｝commandparameter={binding text,element=lblpw}/>
<textblock name=lblpw visible=hidden/>
<passwordbox name=tbpw/>
onclick()
{
lblpw.text = tbpw.password;
}
原文：http://www.cnblogs.com/zhangxiaoshuai/p/5641123.html