private void exitToolStripMenuItem_Click(object sender, EventArgs e)
{
Calculator form2 = new Calculator();
form2.Close();
Ηelp form3 = new Ηelp();
form3.Close();
Ηelp2 form4 = new Ηelp2();
form4.Close();
this.Close();
}
private void showTipsToolStripMenuItem_Click(object sender, EventArgs e)
{
Ηelp form3 = new Ηelp();
form3.Show();
}
