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我正在开发 VisualBasic Windows Phone 应用程序。我试图在内容面板的 bing 地图上添加图钉，但我似乎无法正确访问“图钉”类。这听起来肯定很菜鸟，但我最近两天才开始学习。我非常小心地在这里询问并进行了很好的研究，但我看不出我做错了什么。

我的 xaml.vb 标头看起来像这样

Imports System
Imports System.Threading
Imports System.Windows.Controls
Imports Microsoft.Phone.Controls
Imports Microsoft.Phone.Shell
Imports System.Collections.ObjectModel
Imports System.Windows.Controls.Primitives
Imports System.Device.Location
Imports System.Threading.Tasks
Imports Windows.Devices.Geolocation
Imports System.IO.IsolatedStorage
Imports Microsoft.Phone.Maps
Imports Microsoft.Phone.Maps.Controls
Imports Microsoft.Phone.Maps.Toolkit

和枢轴项目，地图标签在这里合并

            <Grid Margin="0,0,10,0">
                <Grid.RowDefinitions>
                    <RowDefinition Height="0*"/>      
                <RowDefinition/>
                </Grid.RowDefinitions>
                <maps:Map x:Name="myMap" Margin="0,0,10,10" Grid.RowSpan="2"/>
                <TextBlock HorizontalAlignment="Left" Margin="10,37,0,0" Grid.Row="1" TextWrapping="Wrap" Text="Latitude:" VerticalAlignment="Top" Height="27" Width="76"/>
                <TextBlock HorizontalAlignment="Left" Margin="10,59,0,0" Grid.Row="1" TextWrapping="Wrap" Text="Longitude:" VerticalAlignment="Top" RenderTransformOrigin="0.646,1.019" Height="27" Width="94"/>
                <TextBlock x:Name="lat_dbl" HorizontalAlignment="Left" Margin="124,37,0,0" Grid.Row="1" TextWrapping="Wrap" Text="Lat_double" VerticalAlignment="Top" Height="27" Width="97"/>
                <TextBlock x:Name="long_dbl" HorizontalAlignment="Left" Margin="124,59,0,0" Grid.Row="1" TextWrapping="Wrap" Text="long_double" VerticalAlignment="Top" Height="27" Width="110"/>
                <TextBlock x:Name="Status" HorizontalAlignment="Center" TextWrapping="Wrap" Text="Location Service Status" VerticalAlignment="Top" Margin="10,5,233,0" Grid.Row="1" Height="27" Width="203"/>
                <Slider x:Name="pitchSlider_pitch" ValueChanged="sliderChanged_pitch" HorizontalAlignment="Left" Margin="342.844,210.275,-87.156,0" VerticalAlignment="Top" Width="190.312" Height="165.45" RenderTransformOrigin="0.5,0.5" UseLayoutRounding="False" d:LayoutRounding="Auto" Grid.Row="1">
                    <Slider.RenderTransform>
                        <CompositeTransform Rotation="-89.579"/>
                    </Slider.RenderTransform>
                </Slider>
                <Slider x:Name="pitchSlider_zoom" ValueChanged="sliderChanged_zoom" HorizontalAlignment="Left" Margin="244.844,-37.725,0,0" VerticalAlignment="Top" Width="190.312" Height="165.45" RenderTransformOrigin="0.5,0.5" UseLayoutRounding="False" d:LayoutRounding="Auto" Grid.Row="1">
                    <Slider.RenderTransform>
                        <CompositeTransform Rotation="0.598"/>
                    </Slider.RenderTransform>
                </Slider>

            </Grid>

        </phone:PivotItem>
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