!ENTRY org.eclipse.emf.transaction 4 41 2015-11-12 13:56:17.934
!MESSAGE Read-only transaction rolled back
!SUBENTRY 1 org.eclipse.emf.transaction 4 40 2015-11-12 13:56:17.935
!MESSAGE Transaction aborted due to concurrent write
!ENTRY org.eclipse.gmf.runtime.diagram.ui 4 2 2015-11-12 13:56:17.937
!MESSAGE IRJS0007E Semantic refresh failed.
!STACK 0
java.lang.IllegalStateException: Cannot modify resource set without a write transaction

public class TimingIntervalCreateCommand extends EditElementCommand {
	protected CommandResult doExecuteWithResult(IProgressMonitor monitor, IAdaptable info) throws ExecutionException {
		TimingInterval newElement = TimingintervalFactory.eINSTANCE.createTimingInterval();

		//111 BEGIN CUSTOM CODE (Gives Cannot modify resource set without a write transaction)
		this.getEditingDomain().getCommandStack().execute(
				AddCommand.create(this.getEditingDomain(), 
				newElement,
				TimingintervalPackage.Literals.TRIGGER, 
				TimingintervalFactory.eINSTANCE.createTrigger()));
		//111 END CUSTOM CODE 

		TimingIntervalOwner owner = (TimingIntervalOwner) getElementToEdit();
		owner.getTimingIntervals().add(newElement);

		//222 BEGIN CUSTOM CODE (Works fine)
		String name = NameUtils.getName(owner) + "_Ti";
		name = NameUtils.getSafeName(newElement, name, owner, null);
		newElement.setName(name);
		//222 END CUSTOM CODE 
		doConfigure(newElement, monitor, info);

		((CreateElementRequest) getRequest()).setNewElement(newElement);
		return CommandResult.newOKCommandResult(newElement);
	}