Two custom LAF functions can be used to manually redraw it.
laf.registerFunction("drawTableHeaderBackground", function(g, obj) { g.fillAll(Colours.black); }); laf.registerFunction("drawTableHeaderColumn", function(g, obj) { var a = obj.area; g.setColour(Colours.white); g.drawAlignedText(obj.text, a, "centred"); });