title: How to change button background image on mouseOver?
body: <p>I have img1, and img2 in my resources. I have easily set btn.backgroundImage as img1 in btn properties. Images paths are: c:\Project\Resources...</p>
  
  <p>Now I don't know how to set btn.backgroundImage to be img2, I want to do it on event "MouseEnter". So I would apreciate complete code, because I am pretty green about this...</p>
  
  <p>I apreciate any given idea...</p>