Form based @save not working with select mold listbox

<groupbox form="@id('r') @load(vm.selectedResource) @validator(vm.formLevelValidator) @save(vm.selectedResource, before='save') "
					visible="@load(not empty vm.selectedResource)">
	<hlayout>
		<doublebox alue="@bind(r.periodQuantity)" cols="5" constraint="no negative" />
		<listbox mold="select" odel="@bind(r.periodIntervals)"	selectedItem="@bind(r.selectedPeriodInterval)">
			<listhead>
				<listheader sort="auto" />
					</listhead>
						<template name="model" var="t">
							<listitem>
								<listcell 	label="@load(t.title)" />
							</listitem>
						</template>
		 			</listbox>
		<checkbox 	label="Elapsed" checked="@bind(r.periodElapsed)" />
	</hlayout>