Using Subform In Datasheet View To Open Other Form

Well, I couldn't find this using the search, so here it goes:

I have a form in which I enter data to create a new client. Within that form I have a subform in datasheetview which is based on a query which holds/retrieves certain (important) fields from a table that holds case info. So in that one view the client data is displayed on the form and all cases and the most important data from those cases is displayed nicely in one screen.

Now, when a client calls I navigate to that client and see all previous and all current cases that are open and/or closed for this customer. So the customer says case this and that number is the case I need to discuss with you. Now, what I would like is to be able to click or double click anywhere on the line that, for instance, says case nr 55, so that the form(s) belonging to case nr 55 pop up and all info concerning that case is displayed and can be edited as needed.

My problem is: I'm still a newbie and if it was a simple thing like using the on_click event to open the form that's needed, I would not have to post this question. But that can't be done (as far as I know) since the subform is based on a query which is displayed in dataview.

Am I overlooking a very simple solution to this problem or is it really going to be as difficult as I think it's going to be?

For clarification of the idea I have included a screenshot of the form in question. I assume there are tons of databases out there which use such a layout or idea as this one. Please, never mind the buttons etc. It is still a work in progress. ;)