The default Button that Flex provides does not have the following capabilities turned on:

1. Showing a Hand cursor when you hover on the button

2. Handling the Mouse Enter keys to fire a click event

I had a need where I needed these two capabilities all across the board and hence decided to make this as a component that I can use easily. I am uploading the source code as a PDF until I get to host a website where I would be able to upload source code.

Find more controls here