Confrmaton required while pressing push button or preselection button in 800xA
Do we have any feature in 800xA by which System asks confirmation or probe like "whether you want to press this button - Yes or No" while pressing button or selecting preselection in minerals library.
I don't understand about which 800xA system part you are talking about: Process Graphics or Plant Explorer object navigation .
If confirmation required on the PG2 operator screen please check these solutions: http://www402.abbext.com/How-I-configure-Popup-propmpt-push-button-PG2-q10223.a
Try to create one apply and one cancel button from Buttons on graphic editor.
Then change the property Action and change to Applied.
No preselection action is completed by selecting and click apply button, cancel button will cancel the action.
Only possible problem is this on apply/cancel button will work for all preselection in that graphic page, if you change the property Action from system default to Applied.
Try it out, may be this will help you.