>Sometimes (not always) , when I launch my form some of the parts are transparent so I can see through, or sometimes not all the buttons are displayed, but when I press button which calls the form.refresh method everything is ok.
>
>Does anybody have experience with this?

You can check the graphical order of the objects on your form, I mean Send To Back, or Bring To Front them in order you need them. Also you can use This.refresh() as the last line of code in form's Init event.