Examples of usage:

<xp:MultiBinding Converter="{StaticResource StringFormatMultiValueConverter}" ConverterParameter="{}{0} @ {1} by {2}">

<xp:MultiBinding Converter="{StaticResource StringFormatMultiValueConverter}" ConverterParameter="Created by {0} on {1}">

<xp:MultiBinding Converter="{StaticResource StringFormatMultiValueConverter}" ConverterParameter="javascript:executeDialog('WFForm.aspx?wf=EnableDataSrc&amp;autoCloseMode=2&amp;ids={0}&amp;pars=disabled:{1}');">

<MultiBinding Converter="{StaticResource StringFormatMultiValueConverter}" ConverterParameter="Started on {0:g} by {1}" Mode="OneWay">