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Sure you can. You can add code in an event, or size it for 80% of the design window, and let it auto size after that. I’ve done that in my WinForms apps. Just think through what tools are in your toolbox and use them.
For HTML, I never used any designer GUIs. My XAMLs are usually hand-coded, too, but I like to use the designer as a preview tool. I also have some cases of Windows Forms dialogs, where for some reason the visual designer doesn't work, and I must say, this decreases my productivity by at least 50 %.