private void CrearEjercicioBtn_Click(object sender, RoutedEventArgs e)
{
var win = new NuevoEjercicio();
win.Show();
Close();
}
private void EditarBtn_Click(object sender, RoutedEventArgs e)
{
var filaSeleccionada = ((FrameworkElement)sender).DataContext as Exercise;
var win = new NuevoEjercicio(filaSeleccionada);
win.Show();
Close();
}