public CurvesDialog()
{
this.Build ();
drawing.DoubleBuffered = true;
comboMap.Changed += HandleComboMapChanged;
buttonReset.Clicked += HandleButtonResetClicked;
checkRed.Toggled += HandleCheckToggled;
checkGreen.Toggled += HandleCheckToggled;
checkBlue.Toggled += HandleCheckToggled;
drawing.ExposeEvent += HandleDrawingExposeEvent;
drawing.MotionNotifyEvent += HandleDrawingMotionNotifyEvent;
drawing.LeaveNotifyEvent += HandleDrawingLeaveNotifyEvent;
drawing.ButtonPressEvent += HandleDrawingButtonPressEvent;
ResetControlPoints ();
}