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 The Zoom event is called when you have zoomed the image. 
Syntax: 
	MouseDown(Image,minX,minY,maxX,maxY)
  
	Parameters: 
	
		- Image - string - name of the zoomed image
 
		- minX, minY - float - zoombox upper left coordinates
 
		- maxX, maxY - float - zoombox lower right cooddinates
 
	 
	This event has no return value 
 
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