How to determine Form mode

Scriptcase 9
#1

I need to run two different proecdures (methods) based on the Form mode.
In other words, if the Form is in INSERT mode - method1(), but when the Form is in EDIT mode method2()
The Form is called from the grid. After some research most of you say there is no way to read the MODE. Somehow the ADD button puts the Form into INSERT mode and record CHANGE button(icon) puts the Form into EDIT.
When I used CLARION 30 years ago, each Form always had a status and it was expressed by numbers 1-4.
It is rather poor design that SC cannot do the same, or perhaps it does (but internally ) and does not allow the user to read it. Any solutions to this ?

#2 
if ({id_primary_field} < 1) { 
    INSERT mode
} else {
    UPDATE mode
}
#3

OMG ! This is GENIUS !
You are my HERO! Thank you for that. Thank you so much.
IT WORKS!

#4

{id_primary_field} < 1} will work only if {id_primary_field} is numeric and auto incremented

#5

Which is almost always the case, in the other case you need to test if the id is empty

if (empty({id_primary_field})) {
    INSERT mode
} else {
    UPDATE mode
}