The callbacks for TScrollBar do not seem to be connected under gtk - attached is a fix for this. Colin -------------- next part -------------- A non-text attachment was scrubbed... Name: gz00044.gz Type: application/octet-stream Size: 735 bytes Desc: "scroll.patch.gz" Url : http://localhost/pipermail/lazarus/attachments/20031108/8b88c8e3/gz00044.obj