[Lazarus] ButtonPanel uses not same back color as Form uses

[zeljko]

On 12/21/2017 08:11 AM, Alexey via Lazarus wrote:
> This is on Ubuntu 17.10, default theme, gtk2. Pucture, buttonpanel below.

Let me power on my crystal ball to see what lazarus version is there....
Maybe this one hits you: https://bugs.freepascal.org/view.php?id=32779
So, if you are at lazarus trunk >= 56684 then try to change default (as 
in patch at that issue) from clBackground to clForm and then see if that 
helps.

zeljko