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Q. Can I convert an existing field to any form element type listed in the "Type" options under the "Common Form Controls" tab (or create new form elements using any form element type)?

A. No.

The following element types are not supported for full CRUD (create/read/update/delete) operations:

• checkbox
• checkboxes
• date
• file
• managed_file
• password_confirm
• radio
• radios
• tableselect
• vertical_tabs
• weight
• button
• image_button
• submit

Additionally, some form element types must be nested within another type.  For example, tabpanel must be nested within tab.