XAML Converters: `object value` has wrong value?

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I implemented a converter. The problem I am facing is that value is always 0.0, even though videoGridView.ActualHeight is 768.0 when running the app in my simulator. Why? What did I wrong?

public class SetPercentageConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, string language)
    {
        return (double)value;
    }

    public object ConvertBack(object value, Type targetType, object parameter, string language)
    {
        throw new NotImplementedException();
    }
}



<GridView x:Name="videoGridView" ItemsSource="{Binding Movies}" ItemContainerStyle="{StaticResource GridViewItemStyle}" RightTapped="videoGridView_RightTapped">
    <GridView.ItemTemplate>
        <DataTemplate>
            <Image Source="{Binding PosterPath}" Height="{Binding Path=ActualHeight, ConverterParameter=50, Converter={StaticResource SetPercentageConverter}, ElementName=videoGridView, Mode=OneWay}" />
        </DataTemplate>
    </GridView.ItemTemplate>
</GridView>

asked 1 min ago

Daniel

258

XAML Converters: `object value` has wrong value?