private void Leave_Click(object sender, RoutedEventArgs e)
{
MessageBoxResult messageBoxResult = System.Windows.MessageBox.Show("Are you sure you want to leave this group?", "Leave Confirmation", System.Windows.MessageBoxButton.YesNo);
if (messageBoxResult == MessageBoxResult.Yes)
{
GlobalVariables.leaveGroup();
NavigationService navService = NavigationService.GetNavigationService(this);
Groups_Page nextPage = new Groups_Page();
navService.Navigate(nextPage);
}
}