>> I presume this should not happen, and is a bug in LCL-GTK2? Can you post somewhere small proj? I made proj with one btn, I don't see this error. -- Regards, Alexey -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.lazarus-ide.org/pipermail/lazarus/attachments/20170508/d3f06bd4/attachment.html>