Specifies hit test code
The hit test code can be one of the following enumerated values:
- LHT_NONE - no element is hit.
- LHT_TITLE - title is hit.
- LHT_CELL - a legend cell is hit, m_pCell contains a pointer to that cell.
- LHT_SCROLL_UP - up/left scroll button is hit, m_pCell contains a cell covered by scroll button.
- LHT_SCROLL_DOWN - bottom/right scroll button is hit, m_pCell contains a cell covered by scroll button.
