private void NewBtn_Click(object sender, RoutedEventArgs e)
{
EditingWindow newWindow = new EditingWindow();
newWindow.DataContext = new EditingWindowViewModel(Mediator.Instance);
newWindow.ShowDialog();
}
private void EditBtn_Click(object sender, RoutedEventArgs e)
{
MainWindowViewModel viewModel = (MainWindowViewModel)DataContext;
EditingWindow editWindow = new EditingWindow();
editWindow.DataContext = new EditingWindowViewModel(viewModel.CurrentUser.Clone(), Mediator.Instance);
editWindow.ShowDialog();
}