Dispatched when the user presses any divider in this container.
The dividerPress event is dispatched before any dividerDrag events are dispatched.
dividedBox.Pressed(dividerIndex, delta)
                  dividedBox.Pressed(dividerIndex, delta)
                  | Variable | Description | 
|---|---|
| dividerIndex | Contains the zero-based index of the divider being dragged. The leftmost or topmost divider has a dividerIndex of 0. Integer. | 
| delta | Contains the number of pixels that the divider has been dragged. Positive numbers represent a drag toward the right or bottom, negative numbers toward the left or top. Double. |