ComboBox prevents browser scrolling


I have noticed that whenever I include a combo box within my Flash project I can no longer use my mouse wheel to scroll the page when my mouse cursor is within the Flash. At the moment this only happens in Firefox.

The weird thing is that when I use JavaScript to place the Flash on the page it reverses the effect. I can continue to use my mouse wheel as normal in Firefox but it now prevents me from scrolling in Internet Explorer. Again it only prevents the browser window from scrolling if my mouse is placed on the actual Flash.

Has anyone experienced this before and have any good ideas on how to allow the user to continue using the scroll wheel as normal.