CBC_12_CarSearch.xml

<aura:component implements="force:appHostable,flexipage:availableForAllPageTypes">
    
    <!-- searchFormSubmit event handler to call aura method 'searchCars' of
		CarSearchResult component -->
    <aura:handler name="searchFormSubmit" event="c:SearchFormSubmitEvent" action="{!c.doFormSubmit}" />
    
    <!-- Top CarSeachForm Component -->
	<lightning:card title="Search Your Car" class="bottom_margin">
        <c:CarSearchForm />
    </lightning:card>
    
    <!-- CarSearchReult component which has CarTile component nested -->
    <lightning:card title="Matching Cars" class="bottom_margin">
        <c:CarSearchResult aura:id="carSearchResult"/>
    </lightning:card>
    
</aura:component>