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MultiColumnComboBox - Custom Values
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You can write your own value in the Telerik MultiColumnComboBox for Blazor as if it were a textbox, and it will be accepted as an item after you press Enter or blur the input. This way you can provide a list of predefined items and still allow custom values to be inputted.
In the above example, you can either select a t-shirt size from the already provided values, or enter a custom value, in case the provided do not suffice. Note the Custom Size changing to true when a custom value is provided. This is especially useful for situations where usually one would go with a preset value, yet a custom input should be an option.
This MultiColumnComboBox Custom Values example is part of a unique collection of hundreds of Blazor demos, with which you can see all Telerik UI for Blazor components and their features in action. View the source code of the demos from the library or directly adapt, and edit them and their theme appearance in Telerik REPL for Blazor or ThemeBuilder.