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.  |