Type of bounding rectangle. 
By default the bounding rectangle is static (constant extents).
 Bounding rectangles can be changed to dynamic bounding rectangles which can grow horizontally or vertically. 
- Enumerator: 
- 
| eDynamicBoundingRect_None | The bounding rectangle cannot grow. |  | eDynamicBoundingRect_Horizontal | The bounding rectangle can grow horizontally. |  | eDynamicBoundingRect_Vertical | The bounding rectangle can grow vertically. |