xaml - WPF ListBox in TabItem "Property content set more than once" -

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i'm (evidently) new wpf , struggling figure out how put listbox inside tabitem. current attempt below results in property 'content' set more once, answers can't seem relate mine.

<window> <grid>     <tabitem>         <grid background="red"></grid>             <tabitem.header>                 <dockpanel width="130" horizontalalignment="center">                     <textblock text="inventory" foreground="black" fontsize="30" textalignment="center"/>                 </dockpanel>             </tabitem.header>         <listbox>             <listboxitem>test</listboxitem>         </listbox>    </tabitem> </grid> </window>

if point me in right direction that'd appreciated.

ok, edited answer works below. indeed, others suggest, removing "<grid background="red"></grid>" line solves problem. removing following lines:

<listbox>     <listboxitem>test</listboxitem> </listbox>

the grid , listbox views both being set content property of tabitem , cause of error.

if wish use both listbox content of our tabitem, need place them both inside stack panel, below:

<window>     <grid>         <tabitem>             <tabitem.header>                 <dockpanel width="130" horizontalalignment="center">                     <textblock text="inventory" foreground="black" fontsize="30" textalignment="center"/>                 </dockpanel>             </tabitem.header>             <stackpanel orientation="horizontal">                 <grid background="red"></grid>                  <listbox>                     <listboxitem>test</listboxitem>                 </listbox>             </stackpanel>         </tabitem>     </grid> </window>

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