Change in 'select' mold listbox not generating change notofication

<listbox mold="select" width="100%"
	model="@load(vm.workspaces)"
	selectedItem="@bind(vm.selectedWorkspaceItem)"
	disabled="@load(vm.workspaceSelectorDisabled)" onSelect="@command('changeWorkspace')">
	<listhead>
		<listheader ></listheader>
	</listhead>
	<template name="model">
		<listitem>
			<listcell label="${each.title}" ></listcell>
		</listitem>
	</template>
</listbox>

@Command("changeWorkspace")
public void changeWorkspace() {
   postGlobalCommand(new DataViewCommand(ORIGINATOR_PRIMARY_MENU,VIEW_PLANNING_SUMMARY,"Planning summary",getSelectedWorkspaceItem().getID()));
}