Some questions about OGR DGN file

[joanvp]

I'd like to display dgn (microstation) files as a base
cartograhy via OGR.I've tried it with a file
succesfully.  But I'd like to change colors for each
level (roads, altymetry, rivers, ...) because they'sr
ugly and I don't know how...

Another question:
My dgn cartography is divided in a lot of sheets and I
don't know if I need to use a tileindex to show all as
one file or I've to join all in one dgn file

Sorry, there are two questions in one but I need to
know the answer.

Thanks and excuse my english



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