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Size of Control[] and OpenerView in Manipulate

I would like to change the size of some controls in a Manipulate and 
also use an OpenerView.

For reference, I am looking at this nice example from about 9/10 towards 
the bottom of "tutorial/AdvancedManipulateFunctionality":

 ParametricPlot[{a1 Sin[n1 (x + p1)], a2 Cos[n2 (x + p2)]}, {x, 0,
   20 Pi}, PlotRange -> 1.1, PerformanceGoal -> "Quality",
  Axes -> axes, ImageSize -> size],
   Column[{Control[{{n1, 1, "Frequency"}, 1, 4}],
     Control[{{a1, 1, "Amplitude"}, 0, 1}],
     Control[{{p1, 0, "Phase"}, 0, 2 Pi}]}, Right]}],
   Column[{Control[{{n2, 5/4, "Frequency"}, 1, 4}],
     Control[{{a2, 1, "Amplitude"}, 0, 1}],
     Control[{{p2, 0, "Phase"}, 0, 2 Pi}]}, Right]}],
 OpenerView[{"Plot options",
   Row[{Control[{axes, {True, False}}],
     Control[{{size, Medium}, {Small, Medium, Large}}]},
    Spacer[20]]}], ControlPlacement -> Bottom]

1. I'd like the Control[] results to be smaller. However, Control 
doesn't seem to have an option to control its ImageSize.

2. If I try to replace Control with, say, Slider for which I can control 
size, it doesn't work. I don't know why it doesn't work, but it doesn't 
look like it is being evaluated.

3. Even better would be to replace Control with a custom control like 
the next example down in the tutorial,  ValueThumbSlider.

Thanks for any explanation or solution, Craig

W Craig Carter
Professor of Materials Science, MIT

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