>Actually, it seems to be something like navigate('REZ://...
I guess I should admit defeat here (although I may ask my colleague for help).
I've added a hidden input and I've changed the code to be
var form = document.getElementById('frmAddItem');
document.getElementById('txtFake').value = 'btnRemoveOverdue';
//form.action = form.action + '?btnRemoveOverdue=Remove+Overdue' ;
form.submit();
but the passed string now contains an empty txtFake. May be I need to set its text instead of value?
UPDATE. Tried some other things but looks like C++ is not recognizing programmatic changes in DOM. I found a different solution.
If it's not broken, fix it until it is.
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