private void btnAdd_Click(object sender, EventArgs e)
 {
     using (FrmManipulateCar frm = new FrmManipulateCar())
     {
         //Open FrmManipulateCar as child
         frm.ShowDialog(this);
     }
 }
        private void btnEdit_Click(object sender, EventArgs e)
        {
            //Nothing selected
            if (!this.hasSelectedItem())
            {
                return;
            }

            using (FrmManipulateCar frm = new FrmManipulateCar((Car)this.lstCars.SelectedItem))
            {
                //Open FrmManipulateCompany as child
                frm.ShowDialog(this);
            }
        }