ModernWpf Button FlyoutService

example.xaml

<ui:FlyoutService.Flyout>
    <ui:CommandBarFlyout x:Name="AssistiveTouchFlyout" ShowMode="Standard">
        <ui:AppBarButton Click="VolumeDownOnClick" ToolTip="{x:Static resx:Strings.GameView_VolumeDecreaseTip}">
            <ui:AppBarButton.Icon>
                <ui:FontIcon Glyph="{x:Static contract:CommonGlyphs.Volume1}" />
            </ui:AppBarButton.Icon>
        </ui:AppBarButton>
        <ui:AppBarButton Click="VolumeUpOnClick" Icon="Volume" ToolTip="{x:Static resx:Strings.GameView_VolumeIncreaseTip}" />
        <ui:AppBarButton x:Name="FullScreenSwitcher" Click="FullScreenSwitcherOnClick" />
        <ui:AppBarToggleButton x:Name="LoseFocusToggle" Icon="Trim" ToolTip="{x:Static resx:Strings.GameView_FocusTip}" />
        <ui:AppBarToggleButton x:Name="TouchConversionToggle" Icon="TouchPointer" ToolTip="{x:Static resx:Strings.GameView_TouchToMouse}" />

        <ui:CommandBarFlyout.SecondaryCommands>
            <ui:AppBarButton
                Click="ActionCenterOnClick" Icon="DockRight" InputGestureText="Win+A"
                Label="{x:Static resx:Strings.GameView_ActionCenter}" />
            <ui:AppBarButton Click="TaskViewOnClick" InputGestureText="Win+Tab" Label="{x:Static resx:Strings.GameView_TaskView}">
                <ui:AppBarButton.Icon>
                    <ui:FontIcon Glyph="{x:Static contract:CommonGlyphs.TaskView}" />
                </ui:AppBarButton.Icon>
            </ui:AppBarButton>
            <ui:AppBarButton
                Click="ScreenShotOnClick" Icon="Pictures" InputGestureText="Win+Shift+S"
                Label="{x:Static resx:Strings.GameView_ScreenShot}" />

            <ui:AppBarSeparator />
            <ui:AppBarButton Label="{x:Static resx:Strings.GameView_Functions}">
                <ui:AppBarButton.Flyout>
                    <ui:MenuFlyout Placement="Right">
                        <MenuItem x:Name="TouchBoxToggle" Header="{x:Static resx:Strings.GameView_VirtualKeyboard}" IsCheckable="True">
                            <MenuItem.Icon>
                                <ui:FontIcon Glyph="{x:Static contract:CommonGlyphs.KeyboardClassic}" />
                            </MenuItem.Icon>
                        </MenuItem>
                        <MenuItem Click="HookSettingOnClick" Header="{x:Static resx:Strings.HookPage_Title}">
                            <MenuItem.Icon>
                                <ui:SymbolIcon Symbol="Attach" />
                            </MenuItem.Icon>
                        </MenuItem>
                        <MenuItem Click="CloudSaveOnClick" Header="Cloud Saves">
                            <MenuItem.Icon>
                                <ui:FontIcon Glyph="{x:Static contract:CommonGlyphs.Cloud}" />
                            </MenuItem.Icon>
                        </MenuItem>
                    </ui:MenuFlyout>
                </ui:AppBarButton.Flyout>
            </ui:AppBarButton>

            <ui:AppBarButton Click="PreferenceOnClick" Icon="Setting" Label="{x:Static resx:Strings.GameView_Preference}" />
        </ui:CommandBarFlyout.SecondaryCommands>
    </ui:CommandBarFlyout>
</ui:FlyoutService.Flyout>