VF Inline Edit question .

on VF page: 

<apex:form > 
           <apex:pageBlock title="Qualified" mode="inlineedit">
             <table cellpadding="5" style="border-collapse: collapse;table-layout:fixed" width="1120" border="1">
                <tr>
                </tr>
                <apex:variable var="QualRev" value="{!0}"/>
                <apex:repeat value="{!listOfQualified}" var="qd">
                                                                         <tr >
                            <td width="450">
                                <apex:outputField value="{!qd.Next_Step__c}" >
                                     <apex:inlineEditSupport event="ondblclick" showOnEdit="saveButton, cancelButton" />
                                </apex:outputField>
                            </td>
                        </tr>
            </table> 
            <apex:commandButton action="{!saveQD}" value="Update Opptys"/>
            </apex:pageBlock>
           </apex:form>

public PageReference saveQD(){
    UPDATE listOfQualified;
    return null;
    }