标签未显示在应用程序点上

Question

我有一个开发的应用程序，该应用程序的顶部有一个复选框，用于打开/关闭点标签。问题是，它不起作用！据我所知，所有代码都是正确的，但是一定有些错误，我无法发现...

XAML：

<CheckBox x:Name="chkShowLabels" Grid.Row="0" Content="Display Station 
Names" IsChecked="False" FontSize="16" Margin="8"/>

和代码隐藏：

Private Sub chkShowLabels_Checked(sender As Object, e As RoutedEventArgs) Handles chkShowLabels.Checked

    Try
        If Constants.TillNonTillLayer IsNot Nothing Then
            Constants.TillNonTillLayer.LabelsEnabled = True
            Constants.ObservationLayer.LabelsEnabled = True
        End If

    Catch ex As Exception
        Constants.WriteToErrorLog(System.Reflection.MethodBase.GetCurrentMethod.DeclaringType.Name,System.Reflection.MethodInfo.GetCurrentMethod.Name, ex)
    End Try

End Sub


Private Sub chkShowLabels_Unchecked(sender As Object, e As RoutedEventArgs) Handles chkShowLabels.Unchecked

    Try
        If Constants.TillNonTillLayer IsNot Nothing Then
            Constants.TillNonTillLayer.LabelsEnabled = False
            Constants.ObservationLayer.LabelsEnabled = False
        End If

    Catch ex As Exception
        Constants.WriteToErrorLog(System.Reflection.MethodBase.GetCurrentMethod.DeclaringType.Name,System.Reflection.MethodInfo.GetCurrentMethod.Name, ex)
    End Try

End Sub