removeAt method
Implementation
void removeAt(int index) {
_delete.add(index);
// Wait for digest and focus new element
_ngZone.onEventDone.first.then((_) {
if (index < _reorderElements.length) {
_reorderElements[index].focus();
} else if (_reorderElements.isNotEmpty) {
_reorderElements[_reorderElements.length - 1].focus();
}
});
}