Controlgroup: applying styling only on the content part, to avoid changes to buttons in the label. Fixed #5352 - Buttons in the controlgroup label

[aristotelos]

See also http://jsbin.com/onibuc/383

[gseguin]

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Thank you.

[jaspermdegroot]

@aristotelos

Thanks for this PR! I looked into the issue again and decided that we should make the changes you suggested.
We are making a lot of big changes for 1.4 and are working on this in a branch. Because the CSS file looks completely different there I couldn't merge your PR, but had to apply the changes manually. See 963d895.

I tested this with the markup from the JS Bin that you posted at #5352. Everything looked good. You only have to unset the margin top and bottom of the button that you add to the legend.

Thanks again for your contribution!