Ju Bin Liang,
Do you want to display the details in a popup mashup or in the same mashup?
If you just display details in the same mashup, just create a two columns layout, on left, add Grid widget, on right, add several value display widget which will feed with your detail data, and then from your GetDataTableEntries service, nevigate to Selected Row(s) and just drag(bind) the properties you want to dislay to the value display widget one by one.
and if you want to display in a popup mashup, you could add a navigation widget in your mashup, and pass the Selected Row(s) to the parameters you created in the popup mashup. For more details, take reference to: https://support.ptc.com/appserver/cs/view/solution.jsp?n=CS246452&lang=en_US
Thanks,
Br,
Anna