<tt>activeItem</tt> only applies to layout styles that can display items one at a time
(like <a href="output/Ext.layout.AccordionLayout.html" ext:cls="Ext.layout.AccordionLayout">Ext.layout.AccordionLayout</a>, <a href="output/Ext.layout.CardLayout.html" ext:cls="Ext.layout.CardLayout">Ext.layout.CardLayout</a>
and <a href="output/Ext.layout.FitLayout.html" ext:cls="Ext.layout.FitLayout">Ext.layout.FitLayout</a>). Read-only. Related to <a href="output/Ext.Container.html#Ext.Container-activeItem" ext:member="activeItem" ext:cls="Ext.Container">Ext.Container.activeItem</a>.</div></div></td><td class="msource"><a href="output/Ext.layout.ContainerLayout.html#activeItem" ext:member="#activeItem" ext:cls="Ext.layout.ContainerLayout">ContainerLayout</a></td></tr><tr class="property-row expandable inherited"><td class="micon"><a href="#expand" class="exi"> </a></td><td class="sig"><a id="Ext.layout.ContainerLayout-fieldTpl"></a><b><a href="source/ContainerLayout.html#prop-Ext.layout.ContainerLayout-fieldTpl">fieldTpl</a></b> : Ext.Template<div class="mdesc"><div class="short">The Ext.Template used by Field rendering layout classes (such as
<tt>activeItem</tt> only applies to layout styles that can display items one at a time
(like <a href="output/Ext.layout.AccordionLayout.html" ext:cls="Ext.layout.AccordionLayout">Ext.layout.AccordionLayout</a>, <a href="output/Ext.layout.CardLayout.html" ext:cls="Ext.layout.CardLayout">Ext.layout.CardLayout</a>
and <a href="output/Ext.layout.FitLayout.html" ext:cls="Ext.layout.FitLayout">Ext.layout.FitLayout</a>). Read-only. Related to <a href="output/Ext.Container.html#Ext.Container-activeItem" ext:member="activeItem" ext:cls="Ext.Container">Ext.Container.activeItem</a>.</div></div></td><td class="msource"><a href="output/Ext.layout.ContainerLayout.html#activeItem" ext:member="#activeItem" ext:cls="Ext.layout.ContainerLayout">ContainerLayout</a></td></tr><tr class="property-row expandable inherited"><td class="micon"><a href="#expand" class="exi"> </a></td><td class="sig"><a id="Ext.layout.ContainerLayout-fieldTpl"></a><b><a href="source/ContainerLayout.html#prop-Ext.layout.ContainerLayout-fieldTpl">fieldTpl</a></b> : Ext.Template<div class="mdesc"><div class="short">The Ext.Template used by Field rendering layout classes (such as