PmfFormCtrl.dataSourceInitPost Method [AX 2012]

The base implementation of this method calls the same method on all PmfFormCtrl objects that are assigned as sub-controls to this object. All child classes must call this parent method when they override this method. The form must only call this event method when there is actual code that is associated with the event method or any of the sub-controls that are associated with this object.When the associated form data source parameter has not been assigned to this control object, it will automatically be assigned from the data source of the specified record buffer.

Reference