How to merge single binding validationrule errors to bindinggroup?

[飞羽流星]

Example:

<Grid>
<Grid.BindingGroup>
<BindingGroup x:Name="Group"/>
</Grid.BindingGroup>
<TextBox>
<TextBox.Text>
<Binding Path="Name">
<Binding.ValidationRules>
<rules:MyCustomCommonRule BindingGroupName="Group"/>
</Binding.ValidationRules>
</Binding>
</TextBox.Text>
</TextBox>
<TextBox Text="{Binding Name2}"/>
<Button Content="Commit"
IsEnabled="{Binding ElementName=Group,
Path=HasValidationError,
Converter={StaticResource NotConverter}}"/>
</Grid>


If MyCustomCommonRule has return validation error, how to make the button disabled?

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