How to set RichTextArea background color in IE10?

I'm using the following to set the RichTextArea  background color which works for Firefox and most IE versions but with IE10 it just ignores the method.  After calling the method the developer tools indicate the style was not added/set.  Why?  How to do this for IE10?

getElement().getStyle().setBackgroundColor(hexValue);

I'm using GWT 2.5.1

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