Strange things happened yesterday. I have same block of code as You are. After transfering all code to my PC at home everything worked just fine. I realised that some code doesn't work at home. For example, I have page frame with two pages. On first page, I have OCX where I edit, zoom, print etc. picture. On second page in activate method I add objects; first OCX then push buttons on OCX. I had to work that way because any other solution doesn't work (push buttons stayed under OCX and invisible). In deactivate method I removed OCX. At work, everything worked just I planned, but at home deactivate method of page 2 fired activate method of page 2 ?!? After involving another form property and adding some code, problem solved.
Building .EXE file at work and copying it at home work without errors ?!?

Thanks for Your reply.