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I've got an app bar button with a menu of options:

<AppBarButton x:Name="AddButton" x:Uid="AddItem" Icon="Add" RequestedTheme="Dark">
     <AppBarButton.Flyout>
         <MenuFlyout>
              <MenuFlyoutItem Label="Option 1" Click="MenuFlyoutItem_Click" Tag="option1"/>
              <MenuFlyoutItem Label="Option 2" Click="MenuFlyoutItem_Click" Tag="option2"/>
              <MenuFlyoutItem Label="Option 3" Click="MenuFlyoutItem_Click" Tag="option3"/>
         </MenuFlyout>
     </AppBarButton.Flyout>
 </AppBarButton>

The intention is that when the user picks an option, a Flyout window appears next to the button where the window allows the user to provide further information, e.g.:

<Flyout x:Name="MediaTitle">
    <Grid>
         <TextBlock Text"Title" Style="{StaticResource BaseTextBlockStyle}" />
         <TextBox x:Name="descTitle" HorizontalAlignment="Left" Margin="0,30,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="300" />
         <Button x:Name="descTitle_OK" x:Uid="OK" HorizontalAlignment="Right" Margin="0,73,0,0" VerticalAlignment="Top" Click="DescTitle_OKClick" />
    </Grid>
</Flyout>

The Flyout is defined in the page resources section.

In my code, I go:

MediaTitle.ShowAt(AddButton);

but I then get the error "Placement target needs to be in the visual tree".

Is this happening because the button is on the AppBar and not on the page "proper"? If so, is there a way to fix this?

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1 回答 1

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事实证明，答案很简单——我只需要确保应用栏可见。然后，弹出窗口会显示在应用栏上的按钮附近。

由于我没有显示的逻辑/代码，应用栏之前已关闭。

于 2014-02-17T14:03:20.477 回答