Table Column Graphics Erorr

**[Original report](https://bitbucket.org/controlsfx/controlsfx/issue/667) by Josh (Bitbucket: [JoshuaAdams](https://bitbucket.org/JoshuaAdams), GitHub: [JoshuaAdams](https://github.com/JoshuaAdams)).**

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Hi,

Any pre-existing graphics set on Table Columns get cleared and overwritten with the filter.png defined in the Filterpanel.java upon applying filters to tables. This also occurs on the "Reset Filter" action. See screenshot below for further info...


Suggested repair is to modify the FilterPanel.java to only write the new graphic if there are no pre-existing graphics on tablecolumns or apply this filter graphic in a way that does not interfere with pre-existing graphics.

Kind Regards,

Josh