[Typo3] "Type" field in extension

[Hervé Inisan]

Hi!

I'm writing an extension, and the KickStarter is really powerful :-)
In my extension, each item has a type (e.g. : in tt_news, a news item can be
"News", "Link internal Page", "Link external URL").
This is ok (and generated by the KS).

Now: how can I manage the fact a user changes the type?
After the message "Save...?", the item form should change and display other
fields.
Do I have to write PHP code, or can FlexForms help?

For the moment, when type is changed, the form becomes blank (as there is no
definition for type 2, 3 and so on).

Have you got any pointer?

TIA,
-- Hervé Inisan.