Data grid with multiple levels and TableStyles

I have a data grid that is populated by a data set with three tables (Parent and two children) that have a relation set up beteen them. This results in a data grid with three levels.

I can easily apply a table style to the first level in order to hide a column, but I am having difficulty doing the same with the child levels of the grid. I thought it would be a simple matter of using similar code as I did for the root level but this just bombs out.

I think I'm just missing a simple step or two in order to apply table styles to the child levels of the grid, but cannot find any information on it. What is the correct procedure to apply table styles to a partilcular level on the grid?

Thanks

[725 byte] By [Lou_Davis] at [2007-12-23]