Button with image

Hi all,
I need an urgent help please. I am trying to have a button with an image. Actually I simple want to show he image and have it behave as a button. I have created the button and gave it a widthrequest of 120 and Heightrequest of 120 also. I then placed an image of size 120x120. But the image does not get aligned with the button. It shifts somehow showing some parts of the button. How do I make the image alight exactly with the button.
Here's the code
Button btn = new Button
{
WidthRequest = 120,
HeightRequest = 120,
Image = "btnResults.jpg",
};