How to create a REST master details tables ?

Summary

I wanna to create a page with two tables when i select a row from the first the second one change display values

Content

Hi everyone ,

first of all, i am new with VBCS so don't blame me if that look easy 

I did whatch this tuto of ShayJDev and do it but i doesn't work for me.

https://www.youtube.com/watch?v=oXu37_d_Rx4

I have a table that contain customers information and from that table i wanna to display the contacts of a customer when i select it in another table.

Everything work fine but one i click a row nothing happned to the second table.