// This line defines a variable of type ColorTransform and naming it colorTransform 
var colorTransform:ColorTransform = new ColorTransform();

color_btn.addEventListener(MouseEvent.CLICK, paint);

// here is what happens when the button is clicked 
function paint(event:Event):void
{
	colorTransform.color = 0xFF0000;
	test_mc.transform.colorTransform = colorTransform;
}

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