public void OnContextClick(int itemIndex)
{
GenericMenu menu = new GenericMenu();
menu.AddItem(new GUIContent("Unexpose"), false, data => this.Delete((int) data), itemIndex);
menu.AddItem(new GUIContent("Rename"), false, data => this.m_ReorderableListWithRenameAndScrollView.BeginRename((int) data, 0f), itemIndex);
menu.ShowAsContext();
}