private void btnRemove_Click(object sender, EventArgs e)
        {
            if (listGearBox.SelectedItems.Count > 0)
            {
                GearBox gearBoxToDelete = new GearBox();
                gearBoxToDelete = (GearBox)listGearBox.SelectedItems[0];
                foreach (GearBox gb in Program.gearBoxList)
                {
                    if (gb.Equals(gearBoxToDelete))
                    {
                        gearBoxToDelete = gb;
                    }
                }

                Program.gearBoxList.Remove(gearBoxToDelete);
                Database1DataSet1TableAdapters.GearBoxTableAdapter gbta = new Database1DataSet1TableAdapters.GearBoxTableAdapter();
                gbta.Delete(gearBoxToDelete.ID, gearBoxToDelete.Name, gearBoxToDelete.Alpha, gearBoxToDelete.AxesDistance, gearBoxToDelete.GearModule, gearBoxToDelete.InputTorque, gearBoxToDelete.OutputTorque, gearBoxToDelete.TorqueRatio, gearBoxToDelete.InputGear.ID, gearBoxToDelete.OutputGear.ID);

            }
            refreshList();
            treeViewGearBox.Nodes.Clear();
            propertyGridGearBox.SelectedObject = null;
            this.btnRemove.Enabled = false;
            this.btnEdit.Enabled = false;
        }