How to stop the cross icon to show up in the TextItem on IE?

When user types in TextItem, there is a cross icon showing up (only on IE). How do I remove that icon? I have tried to set 'background-image' to 'none' and it does not help. Thanks for the help!

SmartClient Version: v9.1p_2014-07-22/PowerEdition Deployment (built 2014-07-22)

browser(s) and version(s) involved
IE11