The Java™ Step Processor UI Toolkit parameters are system fields, defined in the IVWPanelComponent interface.
While you can add other system fields to your customized Java Step Processor and Launch Step Processors, only the system fields defined in IVWPanelComponent are used by the Process Engine.
All Java Step Processor UI Toolkit beans (controls) that can be contained by VWPanel must implement IVWPanelComponent. IVWPanelComponent provides support for creating user-defined fields for the VWCheckBox, VWLabel, VWTextArea, and WTextField controls.
Refer to the Java Step Processor UI Toolkit beans for more information.