Event of mouse cursor movement

Hi,

I have a requirement where I need to trigger an event whenever cursor of mouse goes one textbox to another textbox. I have two textboxes whenever I give input to first input field based on that value 2nd input field should populate without any enter or pressing F4. I need this on change cursor from one textbox to another textbox.

Please let me know classes or FM for the same.

Thanks and Regards,

Suman