That's a shame.
I know that Construct is primarily aimed at game programming, but with the GUI elements in there too, it can be quite useful for mocking up Windows apps for testing.
I'm finding that more and more, I'm trying to use these GUI for mock-ups, and because of either lack of functionality or bugs, I'm not able to do what I was hoping to do (again, I should stress that I'm talking about non-gaming programming here).
Maybe they should take the GUI elements out of Construct, so the temptation isn't there to use them.
Anyway, for this particular project I've gone back to Visual Studio, which is where I should have gone first really.