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++ |
public event NSSplitView..::..SplitViewAdditionalEffectiveRectOfDividerAtIndexEventHandler SplitViewAdditionalEffectiveRectOfDividerAtIndex
Public Event SplitViewAdditionalEffectiveRectOfDividerAtIndex As NSSplitView..::..SplitViewAdditionalEffectiveRectOfDividerAtIndexEventHandler
public: event NSSplitView..::..SplitViewAdditionalEffectiveRectOfDividerAtIndexEventHandler^ SplitViewAdditionalEffectiveRectOfDividerAtIndex { void add (NSSplitView..::..SplitViewAdditionalEffectiveRectOfDividerAtIndexEventHandler^ value); void remove (NSSplitView..::..SplitViewAdditionalEffectiveRectOfDividerAtIndexEventHandler^ value); }

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)