private void gridView1_PopupMenuShowing(object sender, DevExpress.XtraGrid.Views.Grid.PopupMenuShowingEventArgs e)
        {
                if (e.MenuType == GridMenuType.Column)
                {
                    GridViewColumnMenu menu = e.Menu as GridViewColumnMenu;
                    if (menu.Column != null)
                    {
                        var myMenu = new DXMenuCheckItem("Sola - Kolon Sabitle/Geri Al", menu.Column.Fixed == FixedStyle.Left, default, new EventHandler(FreezeUnfreezeColumnLeft_Click));
                        myMenu.Image = global::MYAPP.Properties.Resources.Left;        //LEFT ARROW ICON FOR myMenu.Image = Left.png

                        myMenu.BeginGroup = true;
                        myMenu.Enabled = true;
                        myMenu.Tag = menu.Column;
                        e.Menu.Items.Add(myMenu);

                        var myMenu2 = new DXMenuCheckItem("Sağa - Kolon Sabitle/Geri Al", menu.Column.Fixed == FixedStyle.Right, default, new EventHandler(FreezeUnfreezeColumnRight_Click));
                        myMenu2.Image = global::MYAPP.Properties.Resources.Right; //RIGHT ARROW ICON FOR myMenu2.Image = Right.png
                        myMenu2.BeginGroup = false;
                        myMenu2.Enabled = true;
                        myMenu2.Tag = menu.Column;
                        e.Menu.Items.Add(myMenu2);
                    }
                }
	}

        private void FreezeUnfreezeColumnLeft_Click(object sender, EventArgs e)
        {
            DXMenuCheckItem item = sender as DXMenuCheckItem;
            GridColumn info = (GridColumn)item.Tag;
            if (info is null)
                return;
            if (info.Fixed == FixedStyle.Left)
            {
                info.Fixed = FixedStyle.None;
            }
            else
            {
                info.Fixed = FixedStyle.Left;
            }

        }

    private void FreezeUnfreezeColumnRight_Click(object sender, EventArgs e)
        {
            DXMenuCheckItem item = sender as DXMenuCheckItem;
            GridColumn info = (GridColumn)item.Tag;
            if (info is null)
                return;
            if (info.Fixed == FixedStyle.Right)
            {
                info.Fixed = FixedStyle.None;
            }
            else
            {
                info.Fixed = FixedStyle.Right;
            }
        }