Binding Converter : IValueConverter 

<src:DateConverter x:Key="dateConverter"/>

<TextBlock Grid.Row="2" Grid.Column="0" Margin="0,0,8,0"
           Name="startDateTitle"
           Style="{StaticResource smallTitleStyle}">Start Date:</TextBlock>
<TextBlock Name="StartDateDTKey" Grid.Row="2" Grid.Column="1" 
    Text="{Binding Path=StartDate, Converter={StaticResource dateConverter}}" 
    Style="{StaticResource textStyleTextBlock}"/>

    public class DateConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            DateTime date = (DateTime)value;
            return date.ToShortDateString();
        }
		
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            string strValue = value as string;
            DateTime resultDateTime;
            if (DateTime.TryParse(strValue, out resultDateTime))
            {
                return resultDateTime;
            }
            return DependencyProperty.UnsetValue;
        }
    }

    <UserControl.Resources>
        <Converters:StyleConverter x:Key="StyleConverter" />
    </UserControl.Resources>

<Control Style="{Binding Path=shape, Converter={StaticResource StyleConverter}, ConverterParameter=DogStyle}" Width="80" Height="80"/>

    public class StyleConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            ResourceDictionary dic = Application.Current.Resources;

            Style returnStyle = new Style();

            switch (parameter.ToString())
            {
                case "DogStyle":
                    if ((String)value == "dog")
                    {
                        returnStyle = dic["dog1"] as Style;
                    }
                    else
                    {
                        returnStyle = dic["dog2"] as Style;
                    }
                    break;
                case "CatStyle":
                    switch ((String)value)
                    {
                        case "YellowCat":
                            returnStyle = dic["YCat"] as Style;
                            break;
                        case "RedCat":
                            returnStyle = dic["RCat"] as Style;
                            break;
                        default:
                            break;
                    }
                    break;
            }
            return returnStyle;
        }

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