Enum which describes the diagram image vertical alignment.
| Enumerator | 
|---|
| VA_Top  | 
 The image is vertically aligned on top.  
 | 
| VA_Center  | 
 The image is vertically centered.  
 | 
| VA_Bottom  | 
 The image is vertically aligned on bottom.  
 | 
| VA_Stretch  | 
 The image is vertically stretched to whole bounding rectangle height.  
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