Ok no respone yet so i'm guessing you folks may want some code to work with.
Here's mine, which I've attached to the :click property of the button (in this case the "next" button) on the master page.......and fails miserably.
var testy = xfa.resolveNode("form1.Page" + Str(xfa.layout.page(this)) +".execValidate()");
if( testy == false){
xfa.host.messageBox("One or more required fields were missing data, please correct them before moving on.");
}
else {
xfa.host.pageDown();
}