Newbie here. Please be gentle :)

I'm attempting to display (and then edit) a related list.

Error (it says line 0):

Save error: Unknown property 'Bookings_Forecast__cStandardController.lForecasts'

 Custom Controller:

public class ForecastBookingsTest {

String StatusText;
public List<Monthly_Forecast__c> lForecasts;
Boolean InsertFlag;
private final Bookings_Forecast__c BF;

// Constuctor for extending the standard controller
public ForecastBookingsTest(ApexPages.StandardController stdController) {
this.BF = (Bookings_Forecast__c)stdController.getRecord();
StatusText = '';
lForecasts = ForecastList();
InsertFlag = false;
}

// Fill list with Forecasts
public List<Monthly_Forecast__c> ForecastList(){
List<Monthly_Forecast__c> fl;
try {
fl = [Select c.id, c.Bkgs_Fcst_Amt__c, c.Shippable__c, c.Est_Bkgs_Amt__c, c.Left_to_Book__c, c.Comments__c, c.Date__c
from Monthly_Forecast__c c where c.Bookings_Forecast__c = :BF.id];
} catch (QueryException e){
system.debug(e.getMessage());
StatusText = e.getMessage();
}
return fl;
}

// Called from Grid to get List of Forecasts
public List<Monthly_Forecast__c> getForecasts () {
if (InsertFlag){
lForecasts.add(new Monthly_Forecast__c(Bookings_Forecast__c = BF.id));
InsertFlag = false;
}
return lForecasts;
}

// Called from Page to pass values from grid to controller
public void setForecasts(List<Monthly_Forecast__c> mf) {
lForecasts = mf;
}

// Called from Page to get StatusText
public String getStatusText() {
return StatusText;
}

// Called from "Save" Button
public PageReference saveForecasts () {
try {
upsert lForecasts;
} catch (DMLException e) {
system.debug(e.getMessage());
StatusText = e.getMessage();
}
lForecasts = ForecastList();
return null;
}

// Called from "Add" Button
public PageReference addForecast () {
InsertFlag = true;
return null;
}
}

 Page:

<apex:page standardController="Bookings_Forecast__c" extensions="ForecastBookingsTest" title="Test Bookings Forecast (Lee)" showHeader="true" sidebar="true">
<apex:detail relatedList="false" title="true"/>
<apex:form >
<apex:pageBlock title="Monthly Forecasts" id="gridform">
<apex:pageBlockButtons >
<apex:commandButton action="{!saveForecasts}" value="Save" id="SaveForecastButton" rerender="gridform" status="status"/>
<apex:commandButton action="{!addForecast}" value="New" id="AddForecastButton" rerender="ForecastTable" status="status"/>
</apex:pageBlockButtons>
<apex:dataTable value="{!lForecasts}" var="item" id="ForecastTable" rowClasses="odd,even" styleClass="" rules="rows" width="100%" columnsWidth="60px">
<apex:column headerValue="Action">
<b><apex:outputLink value="/{!item.id}/e" id="editLink">Edit</apex:outputLink>
|&nbsp;
<apex:outputLink id="delLink" onclick="if ((Modal.confirm && Modal.confirm('Are you sure?')) || (!Modal.confirm && window.confirm('Are you sure?'))) navigateToUrl('/setup/own/deleteredirect.jsp?delID={!item.Id}&retURL=/apex/ForecastBookingsTest?id={!Forecast_Bookings__c.id}');">Del</apex:outputLink></b>
</apex:column>
<apex:column headervalue="Monthly Forecast Name"><apex:outputLink value="/{!item.Id}" target="_self">{!item.name}</apex:outputLink></apex:column>
<apex:column headervalue="Bkgs Fcst Amt" value="{!item.Bkgs_Fcst_Amt__c}"/>
<apex:column value="{!item.Shippable__c}"/>
<apex:column value="{!item.Est_Bkgs_Amt__c}"/>
<apex:column value="{!item.Left_to_Book__c}"/>
<apex:column value="{!item.Comments__c}"/>
<apex:column value="{!item.Date__c}"/>
</apex:dataTable>
<apex:actionStatus id="status" startText="Requesting..." stopText="Data Retrieved!"/>&nbsp;{!StatusText}
</apex:pageBlock>
</apex:form>
</apex:page>

I'm sure I'm missing something simple.

Thanks,

lee