add expandable table row in array control

[gobeli]

Starting point to create an expandpanel for complex array controls. Not sure if it's right to use ListWithDetailMasterItem but it seemed to fit.

[mburri]

I think there should be some kind of indicator that the panel is expandable. The material control shows a little arrow:

This arrow is not needed for list with details - I think you should create a new component for expandable panels.