VB .net WebBrowser Login Box

Bare with me, I'm fairly new to VB and .net.

I have a webrowser inside my Windows Form Application, I navigate to certain address (ex. 10.185.106.25). When navigating to the specific address, a "Windows Security" login box appears, asking for username and password.

Now I want to automate logging in with the credentials needed. This form will be navigating to different addresses throughout it's process, but won't always need the credentials entered depending where it navigates to.

Now, this "Windows Security" Login box does not appear in the Windows Task Manager, meaning it is part of my WebBrowser in my Windows Form Application.

Is there a way to know when this "Windows Security" box appears. Is there some way to know this happened. Is this event? Any explination of how to handle this login box existing would great.

I'm not sure how to handle this inside a Windows Form Application.

Thanks in advance!