Adds a left tab marker to the ruler at the location clicked.
Original signature is '- (void)rulerView:(NSRulerView *)aRulerView handleMouseDown:(NSEvent *)theEvent'
Available in Mac OS X v10.0 and later.

C# | Visual Basic | Visual C++ |
public virtual void RulerViewHandleMouseDown( NSRulerView aRulerView, NSEvent theEvent )
Public Overridable Sub RulerViewHandleMouseDown ( _ aRulerView As NSRulerView, _ theEvent As NSEvent _ )
public: virtual void RulerViewHandleMouseDown( NSRulerView^ aRulerView, NSEvent^ theEvent )

- aRulerView (NSRulerView)
- The ruler view sending the message.
- theEvent (NSEvent)
- The mouse down event.

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