Problems highlightning cell in <t:dataTable

[Carlos Bonzilla]

I have a <t:dataTable with several rows and columns. Each cell in the table consists of a <h:inputText. The value entered in that <h:inputText is then validated by a Validator.

If the cell fails validation, I want it to have red background color. This is the part that does not work. The validation fails, but the cell is not getting red background.

BUT, if a have the same t:column definition outside the table, the validation works fine and the cell is getting red background.

Ex

THIS WORKS FINE
<t:column styleClass="table-content-interesttype" style="white-space: nowrap">
	<f:facet name="header">
		<h:outputText value="Hello" />
	</f:facet>
	<h:inputText value="#{myBean.value}" 
		style="#{style}; background:#{interest.valueChanged ? '#fbec88' : ''};" >
		<f:converter converterId="interestValueConverter" />
		<lf-fclt:interestUpdateValueValidator validatorId="interestUpdateValueValidator" />
	</h:inputText>
</t:column>

<t:dataTable <!-- some attributes>
THIS DOES NOT WORK !
<t:column styleClass="table-content-interesttype" style="white-space: nowrap">
	<f:facet name="header">
		<h:outputText value="Hello" />
	</f:facet>
	<h:inputText value="#{myBean.value}" 
		style="#{style}; background:#{interest.valueChanged ? '#fbec88' : ''};" >
		<f:converter converterId="interestValueConverter" />
		<lf-fclt:interestUpdateValueValidator validatorId="interestUpdateValueValidator" />
	</h:inputText>
</t:column>
</t:dataTable>

To make the cell red I have made a custom PhaseListener with the following pseudocode

 private void colorFields(FacesContext context, UIComponent parentComponent) {
 i List<UIComponent> childComponents = parentComponent.getChildren();

        // TODO move class to dynamic config instead and create a better styleClass!
        final String highlightClass = "error-input-field";
        for (Iterator<UIComponent> i = childComponents.iterator(); i.hasNext();) {
            UIComponent uiComponent = i.next();

            // check if the loop is interested in current uiComponent node
            if (uiComponent instanceof HtmlInputText) {
                // end of recursion
                HtmlInputText input = (HtmlInputText) uiComponent;
                if (!input.isValid()) {
                    // I GET HERE FOR THE T:COLUMN THAT IS OUTSIDE THE T:DATATABLE
                } else {
                    // I GET HERE FOR THE T:COLUMN THAT IS INSIDE THE T:DATATABLE

So the question is : Why is the component inside the datatable considered as valid, if it has failed validation ?