private void citiesToolStripMenuItem_Click(object sender, EventArgs e)
{
CitiesForm cityForm = new CitiesForm();
cityForm.MdiParent = this;
cityForm.Show();
}
private void citiesButton_Click(object sender, EventArgs e)
{
CitiesForm citiesForm = new CitiesForm(_objectModel.Cities, _objectModel.Regions);
citiesForm.ShowDialog();
}