private void btnAdd_Click(object sender, EventArgs e)
        {
            bool open = false;

            foreach (Form f in Application.OpenForms)
            {
                if (f == o)
                {
                    open = true;
                }
            }
            if (!open)
            {
                o = new Ocorrencia();
                o.Show();
            }
            else
            {
                o.Focus();
            }
        }
        private void btnEdit_Click(object sender, EventArgs e)
        {
            bool open = false;

            foreach (Form f in Application.OpenForms)
            {
                if (f == o)
                {
                    open = true;
                }
            }
            if (!open)
            {
                o = new Ocorrencia(dGVOco.SelectedRows[0].Cells[0].FormattedValue.ToString());
                o.Show();
            }
            else
            {
                o.Focus();
            }
        }