CanvasShadowWrapper(DisplayObject displayObject, [ int shadowColor = Color.Black, num shadowOffsetX = 10.0, num shadowOffsetY = 10.0, num shadowBlur = 0.0 ])

Source 

CanvasShadowWrapper(this.displayObject, [
  this.shadowColor = Color.Black,
  this.shadowOffsetX = 10.0, this.shadowOffsetY = 10.0,
  this.shadowBlur = 0.0]);