I've tried everything you've said. See code below.

<TableRow>

<TableCells>

<TableCell>

<ReportItems>

<Textbox Name="PRODUCT_1">

<rd:DefaultName>PRODUCT_1</rd:DefaultName>

<CanShrink>true</CanShrink>

<Style>

<FontFamily>3 of 9 Barcode</FontFamily>

<FontSize>36pt</FontSize>

<TextAlign>Left</TextAlign>

<VerticalAlign>Bottom</VerticalAlign>

<LineHeight>127pt</LineHeight>

</Style>

<CanGrow>true</CanGrow>

<Value>=Fields!PRODUCT.Value</Value>

</Textbox>

</ReportItems>

</TableCell>

</TableCells>

<Height>5.75cm</Height>

</TableRow>

</TableRows>