Dictionary_MyConv.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:local="clr-namespace:FLY.Weight.UI.Client.Converter">
    <local:RatioConverter x:Key="rconv" />
</ResourceDictionary>