ContentControl with ContentProperty missing TypeConverter-Collection of common programming errors

I’m trying to create a ContentControl that displays numbers and allows user to specify values as it’s content 123. I’ve created a very simple class with ContentProperty(“Value”) and a style. However when i try to compile, i get the following error:”The Element type ‘WPFPropertyGrid.NumericInput’ does not have an associated TypeConverter to parse the string ‘123’”I’ve read the help for the ContentProperty and in there it says:

    “If the associated property of a ContentPropertyAttribute is not of type string or object, a type converter will be called at runtime. If a type converter cannot be found at runtime, an exception is thrown.”

I’ve tried marking my Value property with a TypeConverter(typeof(DoubleConverter)) but this didn’t help.Does anyone have any suggestions?

[ContentProperty(“Value”)]    public class NumericInput : ContentControl    {        public static readonly DependencyProperty ValueProperty =            DependencyProperty.Register(“Value”, typeof(double), typeof(NumericInput),

            new FrameworkPropertyMetadata(0.0, new PropertyChangedCallback(OnValueChanged)));

               private static void OnValueChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)        {            NumericInput numericInput = obj as NumericInput;

        }

        [TypeConverter(typeof(DoubleConverter))]        public double Value        {            get { return (double)this.GetValue(ValueProperty); }            set { this.SetValue(ValueProperty, value); }

        }

        public NumericInput()        {            DefaultStyleKeyProperty.OverrideMetadata(typeof(NumericInput), new FrameworkPropertyMetadata(typeof(NumericInput)));                    }    }—————-                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  

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123