Uwp xaml

<Page
    x:Class="APPi.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:APPi"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" Loading="Grid_Loading">

        <CommandBar Margin="95,582,274,0" Height="65" x:Name="commandbar">
            <CommandBar.Content>
                <Grid/>
            </CommandBar.Content>
            <AppBarButton Icon="CellPhone" Label="New Call" Click="AppBarButton_Click"/>
            <AppBarButton Icon="Cancel" Label="Cancel" Click="AppBarButton_Click_1"/>
            <AppBarButton Icon="Volume" Label="Mute" x:Name="MuteUnmute" Click="MuteUnmute_Click"></AppBarButton>
        </CommandBar>

    </Grid>
</Page>

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Well my issue is that every time I go to use MuteUnmute in MainPage.xaml.vb I cant find it.