Create a Front Panel configuration file:
System-wide: /etc/dt/appconfig/types/language/name.fp
Personal: HomeDirectory/.dt/types/name.fp
Copy the definition of the control you want to delete to the new file.
If the control is built-in, its definition is in /usr/dt/appconfig/types/language/dtwm.fp.
You do not need to copy the entire definition. However, the portion you copy must include the fields CONTAINER_NAME and CONTAINER_TYPE.
Add the DELETE field to the definition:
DELETE True
Save the configuration file
Choose Restart Workspace Manager from the Workspace menu.
For example, the following control definition placed in the file /etc/dt/appconfig/types/language/TrashCan.fp removes the Trash Can control from the Front Panel.
CONTROL Trash { CONTAINER_NAME Top CONTAINER_TYPE BOX DELETE True }