Ereignis für Scrollbalken in Scrollbox

[Rollo62]

Ist hier was dabei ?
https://www.win.tue.nl/~wstomv/edu/d...itersGuide.pdf
https://www.google.com/url?sa=t&rct=...nYk_TfSuZz17K8

http://etutorials.org/Programming/ma...rst+Component/
https://www.thoughtco.com/custom-com...opment-1058382