private void button1_Click(object sender, EventArgs e)
        {
            frmVjezba frm = new frmVjezba(null);

            frm.Show();
            this.Close();
        }
 private void dgvVjezbe_CellClick(object sender, DataGridViewCellEventArgs e)
 {
     if (e.ColumnIndex == 3)
     {
         int       id  = Int32.Parse(dgvVjezbe.Rows[e.RowIndex].Cells["Id"].Value.ToString());
         frmVjezba frm = new frmVjezba(id);
         frm.Show();
         this.Close();
     }
 }