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Thank You very much! It works.

Also, I've tried to move whole style definitions to another file in my working directory (ex. "beamerthememystyle.sty"), and it works too, without code You wrote. Strange... but earlier I've used /useoutertheme in my theme file, maybe there was a problem.

Hello!

I want to make some changes in headline navigation (sections and subsections navigation) in split theme. I've tried to add this to my document to override default style:

\setbeamertemplate{headline}
{%
\leavevmode%
\@tempdimb=2.4375ex%
\@beamer@sectionmax=2
\@beamer@subsectionmax=2 ...