More information:
When I tried to delete a page it ask me two times:
Are you sure you want to delete this page.
every time I say yes but it ask the second time.
then it gave me a message with title error and next line said:
Prevent this page from creating additional dialogs and a check box
next to it. I tried to check it one time then repeat the scenario but
it did not make a difference.
thanks
Nancy