API Reference > imodeljs-frontend > QuantityFormatting > CustomFormatPropEditorSpec CustomFormatPropEditorSpec Interface Beta Properties that define an EditorSpec for editing a custom formatting property that is stored in the "custom" property in the FormatProps. The editor controls will be automatically generated in the UI and are limited to a checkbox to set a boolean value, a text dropdown/select component to pick a string value from a list of options, and a text input component that returns a string value. Properties Name Type Description editorType "select" | "checkbox" | "text" label string Defined in core/frontend/src/quantity-formatting/QuantityFormatter.ts Line 58 Last Updated: 29 November, 2022