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Why if IBCQuery.ReadOnly is true, Refresh button on DBNavigator is disabled?
It should allot to refresh dataset how many times you want, why deny this?

This behavior is the functionality of TDBNavigator, not IBDAC.
The Refresh button of the TDBNavigator component is enable only if the corresponding dataset is editable. We can't influence this behavior. So, if you set ReadOnly = True, then the Refresh button will be enable.