Fix the problem, dammit, don’t just tell me about it! I see dialog in Expression Blend often:

Here’s how I get there: I build the solution, I have a look at it, I see what’s wrong, I switch back to Blend, I fix the problem, I want to build it again, and– D’oh! I forgot to close the running app. So I have to close the dialog, switch to the app, close it, switch back, tell it to build again.
As is ususally the case with these stupid, stupid error dialogs, it doesn’t help me at all towards my goal. Yes, I forgot to close the running app so you can’t build on top of it. Yes, that was my mistake. How about not scolding me for it, but actually fixing the problem: close the damn thing, and build it again.
Lazy. Inconsiderate. Bitchy. Fail!

Compile-build-run cycles are lazy and inconsiderate in all cases.
How exactly else am I supposed to preview UI as I’m designing it?