JDK-8210361: Add images to docs for public API classes of controls

[Kevin Rushforth]

They look fine to me. I think placing them next to the code sample, near 
the bottom, seems best.

-- Kevin

On 9/12/2018 1:42 AM, Nir Lisker wrote:
> Hi,
>
> Iv'e started working on JDK-8210361 [1] and I'd like my comment there
> addressed before continuing.
>
> [1] https://bugs.openjdk.java.net/browse/JDK-8210361
>
> Thanks,
> Nir