Saving both parent and child Grids using a single request is not supported out of the box. A similar behavior could be achieved by subscribing to the parent Grid's DataSource requestEnd event
. Once the event is triggered you can check if the type of the request is "create" or "update", get the instances of all child Grids, iterate over their data items, set
a value for the ID field using the one got from the response and finally sync
the child Grid's dataSources.
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