Why the horizontalgauge can not be directly added to the control part of manipulate[]?

Question

I try to use horizontalgauge in Manipulate as following:
    Manipulate[
 Graphics[Disk[]],
 HorizontalGauge[Dynamic[x], {0, 100}]
 ]

but it didn't work, but if I wrap the gauge with Row[] then it works, can anyone explain why it works like this?
    Manipulate[
 Graphics[Disk[]],
 Row@{HorizontalGauge[Dynamic[x], {0, 100}]}
 ]

kglr · Accepted Answer

In Manipulate >> Details and Options allowed forms of the second argument are listed:

So  HorizontalGauge[Dynamic[x], {0,10}] (or, for that matter, Slider[Dynamic[x], {0, 10}] or Checkbox[Dynamic[z]] or InputField[Dynamic[w]] etc.) is not allowed in the second (or later) argument.
The highlighted row of the list is elaborated on as

So using Row @ {HorizontalGauge[...], Style @ HorizontalGauge[...], Text @ HorizontalGauge[...] etc. do work.

Why the horizontalgauge can not be directly added to the control part of manipulate[]?

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