Document Classes ⇒ Beamer Sidebar-Headline Overlap

[java]

I'm using the beamer class to create slides, and I want to have a blue headline and a blue sidebar on each slide. I'm using the command \setbeamersize{sidebar width left=2.4cm} to set the width of the sidebar. The command changes the width of the sidebar, but it doesn't change the width of the darker blue area in the upper left corner of the slide where the sidebar overlaps the headline. So I was wondering what parameters I need to change to make the width of the dark blue overlap area the same as the width of the sidebar?

Thank you very much!

-Kristin