A Beginners Naivety - Varaibles

[Evil_Giraffe]

MainWindow.xaml:

<Window x:Class="MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
    <StackPanel>
        <ComboBox ItemsSource="{Binding Converters}" DisplayMemberPath="TemperatureScaleAbbreviation"
                  SelectedItem="{Binding SelectedConverter}"/>
        <TextBox Text="{Binding Temperature, UpdateSourceTrigger=PropertyChanged}" />
        
        <Label Content="Fahrenheit" />
        <TextBlock Text="{Binding CalculatedTemperatures.Fahrenheit, StringFormat=n2}" />

        <Label Content="Celsius" />
        <TextBlock Text="{Binding CalculatedTemperatures.Celsius, StringFormat=n2}" />

        <Label Content="Kelvin" />
        <TextBlock Text="{Binding CalculatedTemperatures.Kelvin, StringFormat=n2}" />

        <Label Content="Ren" />
        <TextBlock Text="{Binding CalculatedTemperatures.Ren, StringFormat=n2}" />

        <Label Content="Ram" />
        <TextBlock Text="{Binding CalculatedTemperatures.Ram, StringFormat=n2}" />
    </StackPanel>
</Window>