void ButtonSecondaryClick(Window callingWindow)
        {
            ListBox listBox = GuiManager.AddPerishableListBox();

            listBox.AddItem("Set to default");
            listBox.AddItem("Set to null");
            listBox.ScrollBarVisible = false;
            listBox.SetScaleToContents(0);

            listBox.HighlightOnRollOver = true;

            listBox.Click += new GuiMessage(RightClickMenuClick);

            GuiManager.PositionTopLeftToCursor(listBox);
        }
        void RightClickMenu(Window callingWindow)
        {
            ListBox listBox = GuiManager.AddPerishableListBox();

            listBox.AddItem("Zoom In");
            listBox.AddItem("Zoom Out");

            listBox.SetScaleToContents(0);

            listBox.HighlightOnRollOver = true;

            GuiManager.PositionTopLeftToCursor(listBox);

            listBox.ScrollBarVisible = false;

            listBox.Click += SelectItemInRightClickMenu;
        }