[Qt-creator] Signal and sloteditor is not available in the beta version

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Hi.
A few days ago I downloaded the beta version, but I can not find the
signal and slot editor when I'm editing a ui file with the
"integrated" designer, the one where I press the "+" sign to add a new
connection and then select sender, signal, receiver and finaly select
the slot.
It works fine in the ordinary designer.