public class RimItemEditExtension {
 
    private ApexPages.StandardController std;
         
    public List<RIM_Item__c> items; // the associated rim ITEMS          
        
    public Id chosenITEMSId {get; set;} // the chosen rim item id - used when deleting an item
    public String newITEMStype {get; set;} 
    // addmore=public String newITEMSLastName {get; set;} 
	    
    public RimItemEditExtension() {}
     
    public RimItemEditExtension(ApexPages.StandardController stdCtrl) 
    	{
     	std=stdCtrl;
    	}
     
    public RIM__c getRIM() //RIM getRIM
    	{
     	return (RIM__c) std.getRecord();
    	}
 
 	public SObject getSobject()
 		{
  		return std.getRecord();
 		}
      
    private boolean updateITEMS()
    	{
        boolean result=true;
        if (null!=ITEMS)
           {
              // TODO: should work out what's changed and then save, easier to update everything for prototype
            List<RIM_Item__c> updateITEMS=new List<RIM_Item__c>();
            try
              {
               update ITEMS;
              }
              catch (Exception e)
              {
                 String msg=e.getMessage();
                 integer pos;
                  
                 // if its field validation, this will be added to the messages by default
                 if (-1==(pos=msg.indexOf('FIELD_CUSTOM_VALIDATION_EXCEPTION, ')))
                 {
                    ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR, msg));
                 }
                  
                 result=false;
              }
           }
            
           return result;
    }
     
    public PageReference saveAndExit()
    {
     boolean result=true;
    result=updateITEMS();
      
     if (result)
     {
        // call standard controller save
        return std.save();
     }
     else
     {
      return null;
     }
    }
     
    public PageReference save()
    {
     Boolean result=true;
     PageReference pr=Page.RimItemsEdit;
     if (null!=getRIM().id)
     {
      result=updateITEMS();
     }
     else
     {
      pr.setRedirect(true);
     }
      
     if (result)
     {
        // call standard controller save, but don't capture the return value which will redirect to view page
        std.save();
           ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.INFO, 'Changes saved, click Back to return to main file'));
     }
        pr.getParameters().put('id', getRIM().id);
      
     return pr;
    }
 
    public void newITEMS()
    {
       if (updateITEMS())
       {
          RIM_Item__c i=new 
              RIM_Item__c(Transaction_Type__c=newitemstype, RIM__c=getRIM().id);
          insert i;
         
          newitemsType=null; 
          //newField=null;
          items=null;
       }
    }
     
    public void deleteITEMS()
    {
       if (updateITEMS())
       {
          if (null!=chosenITEMSId)
          {
             RIM_Item__c i=new RIM_Item__c(Id=chosenITEMSId);
              delete i;
        
              ITEMS=null;
              chosenITEMSId=null;
          }
       }
    }
     
   	public List<RIM_Item__c> getITEMS() //'List getITEMS'
    {
       if ( (null!=getRIM().id) && (ITEMS == null) )
       {
           ITEMS=[SELECT Id, Transaction_Type__c, Check_Number__c, Transaction_Amount_Detail__c, Fee_Detail__c,
                  Decision__c, Transaction_Amount_Decision__c, Fee_Decision__c, Item_Purpose__c, RIM__c
                         FROM RIM_Item__c 
                         WHERE RIM__c = : getRIM().ID
                         ORDER BY CreatedDate asc];
       } 
                           
       return ITEMS;
    }
}

<apex:page standardController="RIM__c"
           extensions="RimItemEditExtension" 
           tabStyle="RIM__c" title="RIM Item Edit" >
    <apex:pageMessages />
    <apex:form >
        <apex:pageBlock mode="mainDetail">
            
            <apex:pageBlockButtons location="top"> 
                <apex:commandButton action="{!cancel}" value="Back" />
                <apex:commandButton action="{!save}" value="Save" />
                <apex:commandButton action="{!newITEMS}" value="Add Item" rendered="{!NOT(ISBLANK(RIM.id))}" onclick="showpopup(); return false;"/>
            </apex:pageBlockButtons>
            
            
            <apex:pageBlockSection title="Main RIM File Details" collapsible="true" id="mainRecord" columns="2" >                          
            <apex:repeat value="{!$ObjectType.RIM__c.FieldSets.RIMListEdit}" var="field">
               <apex:inputField value="{!RIM__c.[field]}" />
            </apex:repeat>
            </apex:pageBlockSection>
            
           <apex:outputPanel id="ITEMS"> 
                <apex:repeat value="{!RIM_Item__c}" var="itemobj" >
                    <apex:pageBlockSection columns="1"  title="RIM Item {!ITEMobj.Name}" collapsible="true">
                        <apex:pageBlockSectionItem >
                              <apex:pageBlockSection columns="2">
                 <apex:repeat value="{!$ObjectType.ITEMobj.FieldSets.RIMItemListEdit}" var="field">
                     <apex:inputField value="{!ITEMobj[field]}" />
                 </apex:repeat>
                              </apex:pageBlockSection>
                        </apex:pageBlockSectionItem>
                    </apex:pageBlockSection>
                    
                       <div style="text-align:left">
                           <apex:commandButton value="Delete This Item" onclick="idToDelete='{!ITEMS.id}'; showpopup('deletecontent'); return false;"/>
                       </div>
                    
                </apex:repeat>
            </apex:outputPanel>
             
       </apex:pageBlock>
        
        
  <apex:outputPanel id="addPanel">
  <apex:actionRegion id="popupRegion">
   <div id="opaque"/>
      <div id="popupcontent" class="popupcontent" style="width: 250px; height: 100px;">
     Please enter the new RIM item details
 
     <apex:outputLabel value="Transaction Type: "/>
          <apex:inputField id="newitemsType" value="{!ITEMS.Transaction_Type__c}"/>
          
        <apex:commandButton id="cancelBtn" value="Cancel" onclick="hidepopup(); return false;"/>
       <apex:commandButton id="confirmBtn" action="{!newITEMS}" value="Create" rerender="itemsList, addPanel" onclick="hidepopup();" status="working"/>
      </div>
   </apex:actionRegion>
   </apex:outputPanel>
        
        
  <apex:actionRegion id="deleteRegion">
      <div id="deletecontent" class="popupcontent" style="width: 250px; height: 100px;">
     Are you sure you wish to delete RIM Item?
     
 
        <apex:commandButton id="cancelDelBtn" value="Cancel" onclick="hidepopup('deletecontent'); return false;"/>
       <apex:commandButton id="confirmDelBtn" value="Delete" rerender="itemsList" onclick="hidepopup('deletecontent'); alert('Deleting item ' + idToDelete); deleteITEMS(idToDelete); return false;" status="working"/>
      </div>
   </apex:actionRegion>
      <apex:actionFunction name="deleteITEMS" action="{!deleteITEMS}" rerender="contactList" status="working">
         <apex:param name="itemsIdent" value="" assignTo="{!chosenITEMSId}"/>
      </apex:actionFunction>
    </apex:form>        
    <div id="workingcontent" class="popupcontent" style="width:150px; height:50px; margin-top:-100px; marginleft:-100px">
        <p align="center" style='{font-family:"Arial", Helvetica, sans-serif; font-size:20px;}'><apex:image value="/img/loading.gif"/>&nbsp;Please wait</p>
   </div>
 
    <apex:actionStatus id="working" onstart="showpopup('workingcontent');" onstop="hidepopup('workingcontent');" />
  
    
    
	<script>
   		function showpopup(popupname)
   		{
      var name="popupcontent";
      if (popupname)
      {
         name=popupname;
      }
      var popUp = document.getElementById(name);
      popUp.style.display = "block";
      document.getElementById('opaque').style.display='block';
   }
    
   		function hidepopup(popupname)
   		{
      var name="popupcontent";
      if (popupname)
      {
         name=popupname;
      }
      var popUp = document.getElementById(name);
      popUp.style.display = "none";
      document.getElementById('opaque').style.display='none';
   }
    
   		var idToDelete;
    
	</script>

	<style>
  .popupcontent{
   position: fixed;
   top: 100%;
   left: 100%;
   margin-top: -100px;
   margin-left: -100px;
   display: none;
   overflow: auto;
   border:1px solid #CCC;
   background-color:white;
   border:3px solid #333;
   z-index:100;
   padding:5px;
   line-height:20px;
   font-size: 14px;
}
#opaque {
    position: fixed;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 100%;
    z-index: 1;
    display: none;
    background-color: gray;
    filter: alpha(opacity=30);
    opacity: 0.3;
    -moz-opacity:0.3;
    -khtml-opacity:0.3
}
* html #opaque {
    position: absolute;
}
  </style>
    
</apex:page>