Hi Rafelis1997,
But would it be a custom Messagebox or form with different design?
Mas seria um Messagebox personalizado ou formulário com design diferente?
See too:
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Display a Picture on a Flexible Form
https://www.codeproject.com/Articles/33844/Display-a-Picture-on-a-Flexible-Form
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Criando um Messagebox personalizado
https://www.devmedia.com.br/criando-um-messagebox-personalizado/5614
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Trocar formato do form
https://social.msdn.microsoft.com/Forums/pt-BR/b5c424e0-9559-4550-820e-ffee9d32cea7/trocar-formato-do-form?forum=vsvbasicpt
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Como modificar uma janela no Windows Forms? [fechada]
https://pt.stackoverflow.com/questions/205591/como-modificar-uma-janela-no-windows-forms
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How to Install Custom Themes and Visual Styles in Windows
https://www.howtogeek.com/168270/how-to-install-custom-themes-and-visual-styles-in-windows/
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[]'s,
Fabio I.