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How to: Customize the Standard Column Header Menu

The following code sample creates a menu item that fixes the column to the left. This item is added to the column header’s context menu next to the Hide This Column item:

WinForms Grid - Add Items to Context Menus

void gridView1_PopupMenuShowing(object sender, PopupMenuShowingEventArgs e) {
    if (e.MenuType == GridMenuType.Column) {
        DXMenuItem item = new DXMenuItem("Fix/Unfix This Column", (s, args) => {
            GridColumn column = (s as DXMenuItem).Tag as GridColumn;
            if (column.Fixed == FixedStyle.Left)
                column.Fixed = FixedStyle.None;
            else column.Fixed = FixedStyle.Left;
        });
        item.Tag = e.HitInfo.Column;
        int index = e.Menu.Items.IndexOf(e.Menu.Find(GridStringId.MenuColumnRemoveColumn));
        e.Menu.Items.Insert(index + 1, item);
    }
}

Refer to the following help topic for more information: Modify Built-In Context Menus.