private void Modificar(object sender, RoutedEventArgs e)
{
ModificarCliente mc = new ModificarCliente();
mc.Show();
Close();
}
private void modificarClienteToolStripMenuItem_Click(object sender, EventArgs e)
{
this.IsMdiContainer = true;
ModificarCliente MCliente = new ModificarCliente();
MCliente.MdiParent = this;
MCliente.Show();
}