public BuForumPage()
{
InitializeComponent();
DataContext = _forumpageviewmodel;
this.ApplicationBar = (Microsoft.Phone.Shell.ApplicationBar)Resources["forum"];
pgbar.Visibility = Visibility.Collapsed;
_popuppost = new PopupPost();
}
public BuThreadPage()
{
InitializeComponent();
//设定数据上下文
DataContext = _threadview;
ApplicationBar = (Microsoft.Phone.Shell.ApplicationBar)Resources["thread"];
_popupreply = new PopupPost();
_popupreply.titleTextBox.Visibility = Visibility.Collapsed;
//由于隐藏了title，所以缩小控件高度
_popupreply.Height -= 72;
pgbar.Visibility = Visibility.Collapsed;
}