Create Visio Stencil with Code

[Ben]

I have the need to put a bit of code behind a stencil in Visio 2007.
Basically double click the stencil or right click and choose an option to do
this task. This stencil will have several Text boxes on it as well that it
will use as database filters.

IE

---------------------------------
| [Data1 TextBox] |
| |
| [Result TextBox] |
| |
| [Click Me Button] |
---------------------------------

So this shows the need for it to be able to click a button then find sibling
controls for information to fill out infomation in Result Box.

I have seen a URL Stencil that ships with Visio where you right click it and
the option is given to open a URL in IE. So I know this feature exists.

Please point me in the right direction.

Thanks!