void OnGUIToolbarExtension()
        {
            EditorGUILayout.BeginHorizontal(EditorStyles.toolbar);
            int activeSize = 0;

            for (int i = 0; i < m_BytesInRowList.Length; ++i)
            {
                if (m_BytesInRowList[i].Size == m_MemoryMap.BytesInRow)
                {
                    activeSize = i;
                }
            }
            var popupRect = GUILayoutUtility.GetRect(Content.RowSizeLabel, EditorStyles.toolbarPopup);

            if (EditorGUI.DropdownButton(popupRect, Content.RowSizeLabel, FocusType.Passive, EditorStyles.toolbarPopup))
            {
                GenericMenu menu = new GenericMenu();
                for (int i = 0; i < m_BytesInRowList.Length; i++)
                {
                    menu.AddItem(m_BytesInRowList[i].Content, i == activeSize, SetActiveSize, i);
                }
                menu.DropDown(popupRect);
            }

            popupRect = GUILayoutUtility.GetRect(Content.FilterLabel, EditorStyles.toolbarPopup);

            if (EditorGUI.DropdownButton(popupRect, Content.FilterLabel, FocusType.Passive, EditorStyles.toolbarPopup))
            {
                GenericMenu menu = new GenericMenu();
                for (int i = 0; i < m_DisplayElementsList.Length; i++)
                {
                    MemoryMap.MemoryMap.DisplayElements element = (MemoryMap.MemoryMap.DisplayElements)(1 << i);
                    menu.AddItem(m_DisplayElementsList[i], m_MemoryMap.GetDisplayElement(element), (object data) => m_MemoryMap.ToggleDisplayElement((MemoryMap.MemoryMap.DisplayElements)data), element);
                }
                menu.DropDown(popupRect);
            }
            EditorGUILayout.EndHorizontal();
        }