Cannot change the button type after creating it

[aaronvg@…]

Once inserted, one cannot change the button type of a button in a form anymore.

Steps:

- Insert form
- Insert button (type = button)
- Open contextmenu of button
- Type field is disabled.

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Moved from SF:
 http://sourceforge.net/tracker/index.php?func=detail&aid=1501651&group_id=75348&atid=543653

[w.olchawa]

Confirmed on IE and IE7. In FF the problem is bigger because you can't access the button properties. See #703.

[martinkou]

Targeting to 2.6 since it is related to dialogs.

[alfonsoml]

That code would lose any other property that isn't handled by this dialog (like class, style or any event handler). It might not be common, but it is a possibility. So I Review- because that's data loss.

In #676 I added the code to handle also this issue, but there are some ideas (like not creating a new element if the special properties haven't changed) in this patch that I must apply.

[alfonsoml]

Fixed in #676