private void saveToolStripMenuItem_Click(object sender, EventArgs e)
{
Fecha childForm = new Fecha();
childForm.MdiParent = this;
childForm.Text = "Ventana " + childFormNumber++;
childForm.Show();
}
private void button3_Click(object sender, EventArgs e)
{
Fecha frm1 = new Fecha();
frm1.Show();
}