Please ...

- open the first attached spreadsheet:
It contains a unprotected and a protected sheet.

- open the stylist-window if it is not already open:
I have added a user-defined style "Unbenannt1", that is applied to NO cell.

- right-click "Unbenannt1" and click "change" (german: "Ändern..."):
Nothing happens!

- right-click "Unbenannt1" and click "delete" (german: "Löschen..."):
Calc asks if you really want to delete this style.

- press OK:
Nothing happens! You cannot ask if something really should be deleted and then 
do nothing after the user has confirmed!

I think it is in general OK to forbid these changements also if the style is 
not applied, because I think to check such dependencies would be to much work / 
to difficult.

But both, "Ändern..." and "Löschen...", should either open the window that 
locked sheets cannot be changed or be disabled if there are protected sheets in 
the document. But I would prefer the first suggestion, because just disabling 
the items coul be a bit unintuitive: Just imagine a complex spreadsheet 
containing many sheet where only one sheet is protected...
So I think the message that locked sheets cannot be changed would be the best 
solution here. Excel (tested: Excel 2000) also does so...

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Please ...

- open the second attached spreadsheet:
It contains 2 equal sheets, but one is protected. Sheet 1 is the unprotected 
one:

If you select move the focus between A1 and the other cells, you can see in the 
stylist switching between "Standard" and "Ãœberschrift" (german).
This is OK.

- If you do the same in the protected sheet (Sheet2), the stylist does not show 
the current style! I think this should be fixed to also show the style of the 
focused cell within protected sheets.