You can create the Meun Bar in a UserControl, then use it the page which need the Meun Bar.
For example, you can create a UserControl named MyMenuBar
like below:
<DockPanel>
<Menu DockPanel.Dock="Top">
<MenuItem Header="_File">
<MenuItem Header="_Open"/>
<MenuItem Header="_Close"/>
<MenuItem Header="_Save"/>
</MenuItem>
</Menu>
<StackPanel></StackPanel>
</DockPanel>
Then you can use it in Window1
like below:
<local:MyMenuBar></local:MyMenuBar>
The Window1 will show the Meun Bar. Did I misunderstand your question? If I did, could you give me more description of your question for me to anlyze.
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