Index: NSMatrix.m
===================================================================
--- NSMatrix.m	(revision 24334)
+++ NSMatrix.m	(working copy)
@@ -3703,6 +3703,7 @@
 		case NSHighlightModeMatrix:
 		  cell = _cells[_dottedRow][_dottedColumn];
 
+		  [self selectCellAtRow:_dottedRow column: _dottedColumn];
 		  [cell setNextState];
 		  [self setNeedsDisplayInRect: [self cellFrameAtRow: _dottedRow
 						     column: _dottedColumn]];