public static PopularFriendsWindow GetInstance(String accessToken)
{
if (PopularFriendsWindow.instance == null)
{
lock (_syncRoot)
{
if (PopularFriendsWindow.instance == null)
{
PopularFriendsWindow.instance = new PopularFriendsWindow(accessToken);
}
}
}
return PopularFriendsWindow.instance;
}
private void Window_Closed(object sender, EventArgs e)
{
instance = null;
}