Overriding default DataGridItemRenderer in DataGrid

I need to use a custom ItemRenderer for one of my
DataGridColumns, however as soon as I do so, clicking on a row no
longer turns the text white, like the default renderer in another
column. I have already dealt with this in other lists, and had to
hack around it.
Is there a simple solution for that particular style to
cascade down into the elements of my custom renderer? My custom
renderer is basically some images and a Text element inside an
HBox, all wrapped inside a Canvas. I want the Text element to turn
white.

I checked the defaults.css file.Some styles are defined there.But some of them like rollOverColor,selectionColor etc are not defined.
D:\FlexBuilder\sdks\3.0.0\frameworks\projects\framework\defaults.css
DataGrid
    alternatingItemColors: #F7F7F7, #FFFFFF;
    columnDropIndicatorSkin: ClassReference("mx.skins.halo.DataGridColumnDropIndicator");
    columnResizeSkin: ClassReference("mx.skins.halo.DataGridColumnResizeSkin");
    headerColors: #FFFFFF, #E6E6E6;
    headerDragProxyStyleName: "headerDragProxyStyle";
    headerBackgroundSkin: ClassReference("mx.skins.halo.DataGridHeaderBackgroundSkin");
    headerSeparatorSkin: ClassReference("mx.skins.halo.DataGridHeaderSeparator");
    headerStyleName: "dataGridStyles";
    sortArrowSkin: ClassReference("mx.skins.halo.DataGridSortArrow");
    stretchCursor: Embed(source="Assets.swf",symbol="cursorStretch");
    verticalGridLineColor: #CCCCCC;
D:\FlexBuilder\sdks\3.0.0\frameworks\projects\haloclassic\defaults.css
DataGrid
    alternatingRowColors: #F7F7F7, #FFFFFF;
    headerColors: #E6EEEE, #FFFFFF;
    backgroundColor: #FFFFFF;
    borderStyle: "solid";
    columnResizeSkin: ClassReference("haloclassic.DataGridColumnResizeSkin");
    headerSeparatorSkin: ClassReference("haloclassic.DataGridHeaderSeparator");
    headerStyle: "dataGridStyles";
    paddingTop: 2;
    paddingBottom: 2;
    sortArrowSkin: ClassReference("haloclassic.DataGridSortArrow");
    stretchCursor: Embed(source="Assets.swf",symbol="cursorStretch");

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