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[Visual Basic .NET]
Public Delegate Sub OnDoubleClickEventHandler ( _
    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 OnDoubleClickEventHandler (
    int button,
    int shift,
    int X,
    int Y,
    double mapX,
    double mapY
);