Hiding group using "ui_control" node and "button"

[cpaolojo]

Thanks guys for tour replys.
The version of node Red installed in my Raspberry Is 0.18.3.
The name of the tab Is "testgroup" and the groups name are "uno" "due", "tre". So, I've tried the following:

'{"testgroup":{"hide":["testgroup_uno"]}}'
But It doesn t work.
Ant idea?