TAChart: add code to legenddemo to demonstrate the ownerdrawn legend, fix some layout issues.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@44588 4005530d-fff6-0310-9dd1-cebe43e6787f
ButtonEdit: fix building with USEBUTTONEDIT


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@44589 4005530d-fff6-0310-9dd1-cebe43e6787f