Constants to select the position that is referred.
| bsLeft = | 0 | ' Used to get the Left position of an element. |
| bsTop = | 1 | ' Used to get the Top position of an element. |
| bsWidth = | 2 | ' Used to get the Width of an element. |
| bsHeight = | 3 | ' Used to get the Height of an element. |