| Value | Comment |
|---|---|
| WINDOW_BORDER_NONE | No border |
| WINDOW_BORDER_FULL | Border on top, left, right and bottom. |
| WINDOW_BORDER_HORZ | Border on top and bottom. |
| WINDOW_BORDER_VERT | Border on left and right. |
| WINDOW_BORDER_KCGRADIENT | "horizontal border using the gradient bars" - unlikely to work on custom objects as there is no default texture and currently you can't use custom ones. |