Mouse wheel movement if mouse cursor in a field should always work

Given:
A form with a field that's heigth is tall enough to display i.e. 8 lines of text.

A mouse wheel which allows you to scroll the form vertically

Problem:

If the mouse pointer is "inside" the given field frame and has a contetnt that fits completely into the fields frame, the mouse wheel has no more function !

If the mouse ponter is "inside" the given field frame and the field has more content than fits in this field frame, a scroll bar appears on the right of the field frame and the mouse wheel allows to scroll through the field content inside the field frame.

Solution:

It is not convinient and counter intuitive that the mouse wheel has no functionality if the content does not fill the fields frame. Thus please allow to use the mouse to scroll through the form if the content in the field frame is completely visible.