Represents the method that handles the OnMouseDown event.
[Visual Basic .NET] Public Delegate Sub OnMouseDownEventHandler ( _ ByVal button As Integer, _ ByVal shift As Integer, _ ByVal X As Integer, _ ByVal Y As Integer, _ ByVal mapX As Double, _ ByVal mapY As Double _ )
[C#] public delegate void OnMouseDownEventHandler ( int button, int shift, int X, int Y, double mapX, double mapY );