Sure there is the way. Just look in help for "messageBox scripting method".
To display a message box when the form would be opened just fill in "form:ready" event of "form1" object with the following code: xfa.host.messageBox("Your text";"Some title")
Noup, there is no special settings for this. Just open script tab, select form:ready event (or any other you need, depends on use context) in dropdown list. Then language you need (FormCalc by default) and then write script above.
Sure there is the way. Just look in help for "messageBox scripting method".
To display a message box when the form would be opened just fill in "form:ready" event of "form1" object with the following code:
xfa.host.messageBox("Your text";"Some title")
Regards, Andrey