I want to customize warning message box. E.g. I have one _constraints options on one column. I want to customize head and body of custom message. Of course I know that I can set message in _constraints but I want to control the whole message box.
And another subject. Can I add my own message box after user click on my button prepared in my own module? E.g. I want show message "Hi! Your data were saved successfully" after user click my button "proceed"