positining cursor and highlighting section programmatically

hi,

I need to position the cursor and highlight a section of text programatically but cant seem to figure it out.
I used to use a plain old textbox for this using:

blah.Selection.SelLength = 590;
blah.Selection.SelEnd = 890;

How can I do the same thing with the SyntaxEditor? Its probably obvious so sorry for dumb questions :-)

I know about Caret.Offset but it seems to have no visual result though querying the position after using Caret.Offset does show it has moved.....

thanks!