Create new instance of movieClip_A to center of movieClip_B

[ADove]

I am creating a farm game and I am trying to drag an object (red spot) over the ground. When the object rolls over a soil square it highlights a different color. I am trying to drop the object onto the colored soil and have it plant some corn. My cornCrop movieClip is supposed to appear in the middle of the highlighted soil. I posted some code and a screenshot. In the code snippet i have some hard-coded x,y coordinates for the corn stalk to appear. How do I get the corn stalk to dynamically appear in the center of the highlighted soil movieClip? Plus, I can see that I should probably use some sort of array for the corn because I don't know how many times a user will want to plant them. I am not sure how to do that either.

farm.png

if (bucketCorn.hitTestObject(Grid.Cell_3_1))
			{
				var gridID = Grid.Cell_3_1;
				//addCrop();
				//myColorTransform.color = 0x00FF33;
				//Grid.Cell_3_1.transform.colorTransform = myColorTransform;
				trace("Yogi Bear!");
				var cropCorn1 = new CropCorn();
				
				cropCorn1.x = 50;
				cropCorn1.y = 400;


				addChild(cropCorn1);
			}
			
			if (bucketCorn.hitTestObject(Grid.Cell_3_2))
			{
				//addCrop();
				//myColorTransform.color = 0x00FF33;
				//Grid.Cell_3_2.transform.colorTransform = myColorTransform;
				var cropCorn3 = new CropCorn();
				
				Grid.Cell_3_2.addChild(cropCorn3);
				
			}

Thanks,
Alex