Clicking on the connector pane should make hidden controls partially visible
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When doing UI work, it can be quite frustrating rewiring hidden controls to the connector pane. You have to go to the block diagram -> Show Control -> go to front panel and wire it up then hide your control again.
My suggestion is that when you select the Wiring Tool on the front panel or click on the connector pane (to wire up a terminal) all the hidden controls would become partially visible and become connectable to the connector pane.