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<DataGridTextColumn Header="test">
<DataGridTextColumn.Binding>
<MultiBinding Converter="{StaticResource taxPriceMultiValueConvertor}" UpdateSourceTrigger="PropertyChanged" Mode="TwoWay">
<Binding Path="Text" ElementName="ticketType" />
<Binding Path="PurchasePrice" />
<Binding Path="Text" ElementName="taxRate"/>
<Binding Path="TaxPrice" Mode="TwoWay"/>
</MultiBinding>
</DataGridTextColumn.Binding>
</DataGridTextColumn>