Modifying existing driver (newbie question?)

Question

Hi
we are trying to modify an existing driver, but we are fairly new to Labview. We have some generic questions, but I will give some specific info about what we are trying to do as well.
We downloaded a driver (for the NDI Polaris motion tracker) from the NI site and want to modify this a little bit.
The zip file contains an ndipolaris subdirectory with 2 .llb files and some .mnu files.
Our first problem is that if we just open the .llb files, there are a lot of vi's in there (including working examples), but there are no project files, nor class definitions. This seems to prevent us from creating a new class that derives from a class which is apparently defined in the driver (but for which we don't seem to have the definition). Maybe a driver can be distributed without these definitions such that you can only use it, but not modify it?
Our second problem is that if we use the "create new driver from existing driver" method, the NDI Polaris does not show up in the list of existing drivers. (We did copy the ndipolaris directory to the labview/instr.lib directory and restarted labview). (This is probably not a major problem as we could just modify the existing driver instead).
Note that the existing driver is working nicely. We just want to add a time-stamp in the data. The existing driver has apparently a class (called "Tool info", whcih is a cluster of a few different types of data) for all the info that the Polaris returns, so we thought to modify that class or to derive a new class from it with the time-stamp added.
Sorry if this is a trivial question. Thanks for any pointers.
Kris
Solved!
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Answer 1

Hi Dennis
thanks to your suggestions, we've sorted
this out. We were confused by the fact that you cannot add controls
when in "block diagram" view. Here is what we did:
The
data cluster was constructed using  the "bundle by name" function,
which takes a "template" cluster as input. It was this template that we
needed to modify. However, as the template was a "constant", it didn't
show up on the front panel, and so we couldn't add any controls to it.
So, when viewing the block diagram, we right-clicked the
template-cluster, converted it to a control, then switched to the front
panel, created a new (string) control on the front panel, and placed
that into the control corresponding to the template-cluster. Then we
switched back to the block diagram, and converted our template cluster
back to a "constant".
Not straightforward I think, but once you know (i.e. get help from you and read a bit of the manual...),  it's ok.
thanks again
Kris