##### Define > Custom Field Type

# Custom Field Type Overview

Custom Field Type allow you to define field types that are specific to their needs. For each custom field type, you can determine which of the target languages (ASP, ASPX, JSP) are supported, as well as how the field will be displayed and how it will process form data for the supported languages.

The Custom Field Type List dialog box provides the following features:

Field Name or Button Name | Description
Reference Filter drop-down list | Use to select an existing Reference Filter.
Add | Use this button to define new custom field types. Clicking this button opens the Custom Field Type Properties dialog box.
Edit | Use to display the Custom Field Type Properties dialog box for a selected Property.
Copy | Use to copy an existing Reference Filter.
Delete | Use the Delete button to delete an existing custom field type.
Close | Use to close the Custom Field Type List.

When the Add or Edit buttons are selected, the Custom Field Type Properties dialog box displays. It includes the following tabs:

- Definition

- Properties

- ASP Rendering

- ASPX Rendering

- JSP Rendering

- ASP Form

- ASPX Form

- JSP Form