Converter does not work with [custom attributes] in Textbox component

<listbox id="textCriList"
model="@{mainWin$composer.App.Scho.TextCriteria, load-after='mainWin.onDisplay'}"
sizedByContent="false">
	<listhead sizable="true">
		<listheader label="Criteria" sort="auto" />
		<listheader label="Reasons" />
	</listhead>

	<listitem self="@{each='textCri'}" value="@{textCri}"
		height="25px">
		<listcell label="@{textCri.Statement}" />
		<listcell>
			<custom-attributes CriNo="@{textCri.Criteria_No}" />
			<textbox
				value="@{textCri.Criteria_No, converter='sas.application.TextCriAnsConverter', save-after='self.onBlur'}"
				rows="3" width="90%" maxlength="500">
			</textbox>
		</listcell>
	</listitem>
</listbox>

public class TextCriAnsConverter implements TypeConverter {

	@Override
	public Object coerceToBean(Object val, Component comp) {
		if (val != null) {
			if (val instanceof String) {
				// object val is extracted from the attribute which is bound
				// with annotation by its getter method
				String Ans = (String) val;
				Textbox ansField = (Textbox) comp;
				int cri_No = (Integer) ansField.getParent().getAttribute(
						"CriNo");

				// get the application bound with textCriList
				Application binding_app = (Application) ((Listcell) ansField
						.getParent()).getListbox().getAttribute("binding_app");

				AppTextCriteria item = new AppTextCriteria(cri_No, Ans);

				if (Ans.trim().length() > 0) {
					binding_app.addTextCriteriaAns(item);
				} else {
					binding_app.removeTextCriteriaAns(item);
				}
			}
		}

		// can NOT return null; because the receiving bean is int data type by
		// calling setCriteria_No(int criteriaNo)
		return TypeConverter.IGNORE;
	}

	@Override
	public Object coerceToUi(Object val, Component comp) {
		if (val != null) {
			if (comp instanceof Textbox) {
				Textbox ansField = (Textbox) comp;
				// wish to be get from val... :(
				int cri_No = (Integer) ansField.getParent().getAttribute(
						"CriNo");
				// get the application bound with textCriList
				Application binding_app = (Application) ((Listcell) ansField
						.getParent()).getListbox().getAttribute("binding_app");

				if (binding_app != null) {
					AppTextCriteria TextCriAns = binding_app
							.findTextCriteriaAns(cri_No);
					if (TextCriAns != null) {
						// indicate setValue(TextCriAns.getReason())
						return cri_No+": "+TextCriAns.getReason();
					}
				}
			}
		}
		return null;
	}

}

code: null
<listbox id="textCriList"
model="@{mainWin$composer.App.Scho.TextCriteria, load-after='mainWin.onDisplay'}"
sizedByContent="false">
	<listhead sizable="true">
		<listheader label="Criteria" sort="auto" />
		<listheader label="Reasons" />
	</listhead>

	<listitem self="@{each='textCri'}" value="@{textCri}"
		height="25px">
		<listcell label="@{textCri.Statement}" />
		<listcell>
			<custom-attributes CriNo="@{textCri.Criteria_No}" />
			<textbox id="tbid_${textCriList.ItemCount}"
				value="@{textCri.Criteria_No, converter='sas.application.TextCriAnsConverter', save-after='self.onBlur'}"
				rows="3" width="90%" maxlength="500">
			</textbox>
		</listcell>
	</listitem>
</listbox>
code: null
 
 
  
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