How to use a converter

You must add a reference to the Converters namespace: xmlns:converters="clr-namespace:GM.WPF.Converters;assembly=GM.WPF".

Then you can simply use all of the converters: {Binding Converter={converters:MyConverter}}.

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An example of using the ObjectToVisibilityConverter with the Collapse parameter:

<StackPanel Visibility="{Binding MyViewModelProperty, Converter={converters:ObjectToVisibilityConverter}, ConverterParameter=Collapse}">
    <!-- The content -->
</StackPanel>