Hello Developers!

I created some small vf-page to show related items from an object. On this page I enabled inline editing and my page looks like this:

<apex:page StandardController="Milestone1_Project__c" showHeader="true" sidebar="false"  extensions="saveMilestones" tabStyle="Milestone1_Milestone__c">

<apex:pageMessages id="ex"/>
    <apex:form >
        <apex:pageBlock >

                

                <apex:pageBlockButtons >

                 <apex:commandbutton action="{!saveit}" value="Saveit"/>   

                    

                </apex:pageBlockButtons>

<apex:pageBlockSection title="Header" collapsible="false">
        <apex:outputField value="{!Milestone1_Project__c.Name}"/>
        
</apex:pageBlockSection>



        <apex:pageBlock title="Milestones">
                <apex:pageBlockTable value="{!Milestone1_Project__c.Project_Milestones__r}" var="ml"  width="100%">
                            <apex:column value="{!ml.Name}" />
                                  
                           
                            
                            <apex:column headerValue="Kickoff" >
                                  <apex:outputField value="{!ml.Kickoff__c}">
                                  <apex:inlineEditSupport event="ondblClick"/>
                                  </apex:outputField>
                            </apex:column>
                            
                            <apex:column headerValue="Deadline" >
                                  <apex:outputField value="{!ml.Deadline__c}">
                                  <apex:inlineEditSupport event="ondblClick"/>
                                  </apex:outputField>
                            </apex:column>
                            
                            <apex:column headerValue="Complete" >
                                  <apex:outputField value="{!ml.Complete__c}">
                                  <apex:inlineEditSupport event="ondblClick"/>
                                  </apex:outputField>
                            </apex:column>
        
        </apex:pageBlockTable>        
        </apex:pageBlock>

        </apex:pageBlock>
    </apex:form>
</apex:page>

And here is my controller extension to save the changes:
 

public class saveMilestones
{
public Milestone1_Project__c proj{get;set;}


public saveMilestones(ApexPages.StandardController stdController)
{
 proj = [SELECT  Id, Name , Opportunity1__c,  (SELECT Id, Name,
 Kickoff__c, Deadline__c, complete__c, Project__c FROM 
 Project_Milestones__r order by Name ) FROM Milestone1_Project__c where Id
 =:ApexPages.currentPage().getParameters().get('id')];
}

public PageReference saveit(){

update proj.Project_Milestones__r;


             
            return null;



}
}

It seems to save the new values, but if I go back to my master-object "Projects", I have all the old values in it - so indeed nothing is saved. What am I missing?