Hello Jaroslaw,
An answer that is related to your question has been posted by Roberto Bozzolo for "DisplayPanel() interferes with menu selection" question posted by Woolie Willie on 7/16/2001. The answer can be viewed by following the link below:
http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HOID=50650000000800000003250000&UCATEGORY_0=_46_%24_7_&UCATEGORY_S=0
Regards,
Silvius
Silvius Iancu