Getting the active window

Hi All

I have some code for an addin that I'm currently writing for Solidworks 2009. Most of it is done but there is a problem I'm running into -

I'm trying to get the measure tool to measure between 2 points - got that part done. But instead of showing the measure tool itself, I only want to show the x,y,z difference. So in other words i'd like to hide the measure tool window.

Someone suggested I use the hwnd = GetActiveWindow to hide the measure tool window.

Only problem is my own addin has a button that you click in order to do this. So this is what's wrong:

1. click button to measure
2. hwnd = GetActiveWindow