Comment by ndiddy

In my experience drag-and-drop GUI editors work great until you add the constraint that the window has to be resizeable. Then it becomes a mess of clicking through dialogs for every UI element to make sure the anchoring and display flow is set up correctly, and you often have to go back and redo this whenever you add a new element or change the layout of the form. I think the best GUI programming experience I've ever had is on Palm OS simply because it had the constraint that every program always displayed in fullscreen at 160x160 (pixel-doubled to 320x320 on later devices) so you never had to deal with resizeable windows.