Notes About the Form Designer

For the painting of controls in the form designer, CustomControl instances are instantiated and then release immediately after painting has finished. The design-mode flag is exposed on the framework’s SerializeInfo.RuntimeUISrzIsDesignMode — controls that want to render a placeholder only inside the designer (the way WaynesTimer draws its 🕑 glyph) check this flag during Initialize.

See also

• CustomControls package reference – overview of the framework and the built-in Waynes… controls