how to display the selected row from the data table in model panel ??

the below displayed is my datatable:tableDatas.xhtml

<rich:dataTable value="#{tableRecordBean.dataList}" var="dataItems" onRowClick="#{rich:component('md1')}.show()" onRowMouseOver="this.style.backgroundColor='#B5F3FB'" onRowMouseOut="this.style.backgroundColor='#{a4jSkin.rowBackgroundColor}'" rowClasses="row1, row2, row3" id="taskList" rows="3" columnClasses="50,100,50" width="350">
    <f:facet name="caption">
        <h:outputText value="This is caption..." />
    </f:facet>

    <f:facet name="header"> 
        <h:outputText value="Student Study System" /> 
    </f:facet> 



    <rich:column>
        <f:facet name="header"> Student ID </f:facet>
        <h:outputText value="#{dataItems.stu_ID}" />        
    </rich:column>

    <rich:column>
        <f:facet name="header"> Student Name </f:facet>
        <h:outputText value="#{dataItems.stu_NAME}" />      
    </rich:column>

    <rich:column>
        <f:facet name="header"> ExamHall No. </f:facet>
        <h:outputText value="#{dataItems.ehall_NO}" />      
    </rich:column>
</rich:dataTable>    

</rich:simpleTogglePanel>

<rich:modalPanel id="md1" width="250" height="150">
    <f:facet name="header">
        Student Information
    </f:facet>


    <h:panelGrid id="studentInfo" columns="2">
        <h:outputText value="student ID" />
        <h:outputText value="#{dataItems.stu_ID}" />
        <h:outputText value="Exam Hall No:" />
        <h:outputText value="#{tableData.ehall_NO}" />
        <h:outputText value="Name:" />
        <h:outputText value="#{dataItems.stu_NAME}" />


    </h:panelGrid>
    <f:facet name="controls">
        <h:commandButton value="close" style="cursor:pointer" onclick="#{rich:component('md1')}.hide()" />
    </f:facet>

tTableRecordBean.java

package Datas;

import java.util.ArrayList; import java.util.Iterator;

//import javax.faces.event.ActionEvent; //import java.util.List;

public class TableRecordBean {

private ArrayList <TableData> dataList;
private ArrayList <TableData> selectList;


public void assignDataList()
{
    dataList= new ArrayList <TableData>();

    TableData rec1=new TableData(); 
    rec1.setStu_ID("G001");
    rec1.setStu_NAME("Kanna");
    rec1.setEhall_NO(100);

    TableData rec2=new TableData();
    rec2.setStu_ID("G002");
    rec2.setStu_NAME("Krishna");
    rec2.setEhall_NO(101);

    TableData rec3=new TableData();
    rec3.setStu_ID("G003");
    rec3.setStu_NAME("Karthik");
    rec3.setEhall_NO(102);

    dataList.add(rec1);
    dataList.add(rec2);
    dataList.add(rec3); 



}

public ArrayList <TableData> selected()
{

    Iterator<TableData> dataItr = dataList.iterator();

    while(dataItr.hasNext())
    {
        TableData td =dataItr.next();
        if((dataList.indexOf(td))==1);
        {
            selectList=dataList;
        }
        //System.out.println("Current :"+td.getStu_ID()+"\t"+td.getStu_NAME()+"\t"+td.getEhall_NO());
    }
    return selectList;

}

/*public void onClick()
{

    Iterator<TableData> dataItr = dataList.iterator();

    while(dataItr.hasNext())
    {
        Object obj=dataItr.next();
        System.out.println("Current :"+obj);
    }
}*/

public ArrayList <TableData> getDataList() {
    assignDataList(); 
    return dataList;
}

please help me out !~!!!!! i get the model panel but the values are unable to transfer to the model panel....