sap.f.SemanticPage: adding more than 1 content control fails - sapui5

Question

I am trying to get three panels to show on my object page but for some reason it shows only the last panel like it is shown on the screenshot:
The Object.view.xml looks like the following:
<mvc:View controllerName="ns.mngportfolios.controller.Object" xmlns="sap.m" xmlns:mvc="sap.ui.core.mvc" xmlns:semantic="sap.f.semantic" xmlns:form="sap.ui.layout.form">
<semantic:SemanticPage id="page" headerPinnable="false" toggleHeaderOnTitleClick="false" busy="{objectView>/busy}" busyIndicatorDelay="{objectView>/delay}">
<semantic:titleHeading>
<Title text="{PORTFOLIO_NUMBER}" level="H2" responsive="true" />
</semantic:titleHeading>
<semantic:headerContent>
<ObjectNumber number="{
path: 'EBITDA',
formatter: '.formatter.numberUnit'
}" />
<ObjectAttribute text="{COMPANY_NAME}" />
</semantic:headerContent>
<Panel class="sapUiResponsiveMargin" width="auto" headerText="{i18n>portfolioTitle}" expandable="{device>/system/phone}" expanded="true">
<content>
<form:SimpleForm id="objectForm">
<form:content>
<Label text="{i18n>portfolioSharesLabel}" />
<Text text="{PORTFOLIO_SHARES}" />
<Label text="{i18n>portfolioNameLabel}" />
<Text text="{PORTFOLIO_NAME}" />
<Label text="{i18n>portfolioDepreciationLabel}" />
<Text text="{= ${DEPRECIATION} + ' ' + 'EUR'}" />
</form:content>
</form:SimpleForm>
</content>
</Panel>
<Panel class="sapUiResponsiveMargin" width="auto" headerText="{i18n>yearTitle}" expandable="{device>/system/phone}" expanded="false">
<content>
<List id="companyList">
<items>
<StandardListItem icon="sap-icon://building" title="Building1" />
<StandardListItem icon="sap-icon://email" title="abcd#mail.com" />
<StandardListItem icon="sap-icon://world" title="google.com" />
<StandardListItem icon="sap-icon://phone" title="+00123456789" />
<StandardListItem icon="sap-icon://map" title="23 Wall st, 10005 NY" />
</items>
</List>
</content>
</Panel>
<Panel class="sapUiResponsiveMargin" width="auto" headerText="{i18n>mapTitle}">
<Image src="{
parts: [
'23 Wall St',
'10005',
'New York',
'United States'
],
formatter: '.formatter.formatMapUrl'
}" />
</Panel>
<semantic:sendEmailAction>
<semantic:SendEmailAction id="shareEmail" press=".onShareEmailPress" />
</semantic:sendEmailAction>
</semantic:SemanticPage>
</mvc:View>
Can someone help me to identify the missing piece here?

Answer 1

"content" aggregation of sap.f.semantic.SemanticPage has a Cardinality of 0..1. This means we can add a maximum of one child control. To accomplish the task of displaying 3 panels, try embedding all three panels inside a container. A few examples of containers which could be used can be found in samples page under the category containers and layouts.
To provide an example :-
<mvc:View controllerName="ns.mngportfolios.controller.Object" xmlns="sap.m" xmlns:mvc="sap.ui.core.mvc" xmlns:semantic="sap.f.semantic" xmlns:form="sap.ui.layout.form">
<semantic:SemanticPage id="page" headerPinnable="false" toggleHeaderOnTitleClick="false" busy="{objectView>/busy}" busyIndicatorDelay="{objectView>/delay}">
<semantic:titleHeading>
<Title text="{PORTFOLIO_NUMBER}" level="H2" responsive="true" />
</semantic:titleHeading>
<semantic:headerContent>
<ObjectNumber number="{
path: 'EBITDA',
formatter: '.formatter.numberUnit'
}" />
<ObjectAttribute text="{COMPANY_NAME}" />
</semantic:headerContent>
<VBox>
<items>
<Panel class="sapUiResponsiveMargin" width="auto" headerText="{i18n>portfolioTitle}" expandable="{device>/system/phone}" expanded="true">
<content>
<form:SimpleForm id="objectForm">
<form:content>
<Label text="{i18n>portfolioSharesLabel}" />
<Text text="{PORTFOLIO_SHARES}" />
<Label text="{i18n>portfolioNameLabel}" />
<Text text="{PORTFOLIO_NAME}" />
<Label text="{i18n>portfolioDepreciationLabel}" />
<Text text="{= ${DEPRECIATION} + ' ' + 'EUR'}" />
</form:content>
</form:SimpleForm>
</content>
</Panel>
<Panel class="sapUiResponsiveMargin" width="auto" headerText="{i18n>yearTitle}" expandable="{device>/system/phone}" expanded="false">
<content>
<List id="companyList">
<items>
<StandardListItem icon="sap-icon://building" title="Building1" />
<StandardListItem icon="sap-icon://email" title="abcd#mail.com" />
<StandardListItem icon="sap-icon://world" title="google.com" />
<StandardListItem icon="sap-icon://phone" title="+00123456789" />
<StandardListItem icon="sap-icon://map" title="23 Wall st, 10005 NY" />
</items>
</List>
</content>
</Panel>
<Panel class="sapUiResponsiveMargin" width="auto" headerText="{i18n>mapTitle}">
<Image src="{
parts: [
'23 Wall St',
'10005',
'New York',
'United States'
],
formatter: '.formatter.formatMapUrl'
}" />
</Panel>
</items>
</VBox>
<semantic:sendEmailAction>
<semantic:SendEmailAction id="shareEmail" press=".onShareEmailPress" />
</semantic:sendEmailAction>
</semantic:SemanticPage>
</mvc:View>
Please choose the container control that best suits your layout demands.This is just an example.