AddWatch window in .NET

I need to catch when text in Combo changes. In VB6 I would use AddWatch with setting Combo.Text in Expression text box and selecting option "Break when value changes".
I cannot realize how to do it in VB.NET. I tried AddWatch in run mode. It just displays the value of Combo.Text. I tried to set BreakPoint and played with Condition. No success so far.
Any help please
Vlad

I don't think it's implemented yet, but to see where you'd do it if it were, Click Debug... New BreakPoint

I said in my initial post that I tried BreakPoint with no success
Vlad