private void ChatHistoryView_Loaded(object sender, RoutedEventArgs e)
{
HisMsgTarget = this.flowDoc;
this.Loaded -= ChatHistoryView_Loaded;
this.calendar.DisplayDateEnd = DateTime.Now;
this.rbtnAll.IsChecked = true;
}
private void ChatHistoryView_Unloaded(object sender, RoutedEventArgs e)
{
HisMsgTarget = null;
}
