Datagrid header - right click to select what columns to show

Hi,

Since we cannot use the datagrid widget (http://communities.vmware.com/thread/433973), I've been trying to find a way to mimic the default behaviour and show a contextMenu on the datagrid header right click, but with no success. I tried to use contextMenu property, but it seems like the web client disables this. Is there a way to catch the right click event and create a contextMenu in the web client?

Thanks