Allows the delegate to return an additional rectangle in which mouse clicks will initiate divider dragging.
Original signature is '- (NSRect)splitView:(NSSplitView *)splitView additionalEffectiveRectOfDividerAtIndex:(NSInteger)dividerIndex'
Available in Mac OS X v10.5 and later.

C# | Visual Basic | Visual C++ |
NSRect SplitViewAdditionalEffectiveRectOfDividerAtIndex( NSSplitView splitView, NSInteger dividerIndex )
Function SplitViewAdditionalEffectiveRectOfDividerAtIndex ( _ splitView As NSSplitView, _ dividerIndex As NSInteger _ ) As NSRect
NSRect SplitViewAdditionalEffectiveRectOfDividerAtIndex( NSSplitView^ splitView, NSInteger dividerIndex )

- splitView (NSSplitView)
- The split view that sent the message.
- dividerIndex (NSInteger)
- The index of the divider.

An additional rectangle in which mouse clicks should initiate divider dragging. The rectangle should be expressed in the coordinate system defined by splitView. Returning NSZeroRect indicates no additional dragging rectangle is desired.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)