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Pick list filter on column of visual force table

I would like to filter the column "Status" of my table by selecting a value in a pick list which is integrated in the column header:
<table class="list" border="0" cellpadding="0" cellspacing="0" id="maintable">
    <thead class="rich-table-thead">
        <tr class="headerRow">
            <th class="headerRow"> Name</th>
            <th class="headerRow">Status &nbsp;&nbsp;                               
                <apex:selectList id="searchStatus" value="{!selectedStatus}" size="1" onchange="getlistDevRequests">
                    <apex:selectOptions value="{!Status}" />
            <th class="headerRow">Start Date</th>       
    <apex:repeat value="{!lstDevRequests}"  var="item">
            <tr class="dataRow">
                <td><span class="status" >{!item.Status__c}</span></td>
                <td><apex:outputText value="{0,date,MM/dd/yyyy}"> <apex:param value="{!item.Start_Date__c}" /> </apex:outputText></td>
public with sharing class tableDevRequests {

    List<Dev_Request__c> lstDevRequests;
    public String selectedStatus{get;set;}

    public tableDevRequests() {


    public List<SelectOption> getStatus() {
        List<SelectOption> statOptions= new List<SelectOption>();
        statOptions.add( new SelectOption('-1','--All Status--'));
        for( Dev_Request__c dev : [select Id,Status__c from Dev_Request__c ] ) {
            statOptions.add( new SelectOption(dev.Id,dev.Status__c)); /*SelectOption list takes two parameters one is value and other one is label .In this case account name as a label and Id is the value .*/
        return statOptions;

    public List<Dev_Request__c> getlstDevRequests() {
        if(lstDevRequests == null)
            lstDevRequests = [Select Id, Name, Assignee__c, Assignee__r.Name, Start_Date__c, Due_Date_QA__c, Estimated_Hours__c, Estimated_Completion_Date__c, Status__c, Overview__c, Parent_Dev_Request__c, (SELECT Id, WhatId, ActivityDAte, Owner.Name, Description, Status, Subject from Tasks) from Dev_Request__c];
        return lstDevRequests;

How would I modify my code?