chordmode bass and relative

[Mark]

Hi All
Having a small problem with chordmode, displaying chords within the staff.
I wish to display some chords on a bass clef.
Decided that chordmode in this instance was the best way. (im tidying up 
from a simple "chords above lyrics" doc. So I dont know the notes. Of 
course I could work them out)

The snip below shows a note progression of dedga which all sit nicely on 
the bass clef staff as expected. (my test phrase)
However when I do the same thing  using chordmode the chords are way off 
the top of the staff. As if the relative and clef commands are ignored.
I tried inserting clef and relative commands within the chordmode 
command but recieved errors.

I had to "d, e,,:m d, g,, a,,:sus}" to force it to look like what I 
anticipated.
Im not sure if its a bass clef v chordmode problem or just not utilising 
chordmode correctly

\new Staff {
\clef bass
\key d \major
\relative c {
d e d g a}
\chordmode {
d e:m d g a:sus}

}

Thanks Mark