Hi
Sophie,
Straight to the points:
1. You can access the header item during the PreRender event handler of the grid and traverse and hide the mentioned TableCells by using their Visible="false" or .Style["display"]="none" property. However, please note that this requirement is not tested and may prove error-prone.
2. You will need to pass a valid DataSourceID to the inner grid as demonstrated in the following live sample:
http://demos.telerik.com/aspnet-ajax/grid/examples/hierarchy/hierarchy-with-templates/defaultcs.aspx
Alternatively, you can use programmatic databinding with the DataSource property, similar to attached web site sample.
I hope this will prove helpful.
Regards,
Eyup
Telerik
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