private void refreshNewsPage()
{
Microsoft.Phone.Shell.SystemTray.ProgressIndicator = new Microsoft.Phone.Shell.ProgressIndicator();
m_progressIndicatorHelper = new ProgressIndicatorHelper(Microsoft.Phone.Shell.SystemTray.ProgressIndicator, RefreshViewHelper.RefreshViewItems);
m_progressIndicatorHelper.PushTask("Weibo");
m_progressIndicatorHelper.PushTask("Rss");
m_progressIndicatorHelper.PushTask("Renren");
m_progressIndicatorHelper.PushTask("Douban");
//App.ViewModel.Items.Clear();
// 1.Weibo
refreshModelSinaWeibo();
// 2.Rss
refreshModelRssFeed();
// 3.Renren
refreshModelRenren();
// 4:Douban
refreshModelDouban();
App.ViewModel.IsChanged = false;
}