ComboBox ItemRenderer inside Datagrid

I have a DataGrid with a ComboBox as an ItemRenderer for one of my columns. When the user selects a row, I want to get the ComboBox's selected value for the selected row on clicking Submit.The datagrid has many columns and user has to select one value for each row.How to find out the selected value of the combo-box??


Here is my code:

<mx:DataGrid id="namesgrid" width="834" height="354" dataProvider="{List}"
                  resizableColumns="true" draggableColumns="true"
                  doubleClick="onGridClick()" doubleClickEnabled="true" x="0" y="0">
                  <mx:columns>
                        <mx:DataGridColumn id="bid" headerText="BName" dataField="branchdesc" width="100"/>
                        <mx:DataGridColumn id="poid" headerText="P-ID" dataField="proddesc" width="100"/>
                        <mx:DataGridColumn id="acid" headerText="No" dataField="accountno" width="80"/>
                        <mx:DataGridColumn id="nac" headerText="Name" dataField="mainpersonname" width="275"/>
                        <mx:DataGridColumn id="art" headerText="Type" dataField="recordtype" width="200"/>      
                <mx:DataGridColumn id="cmbtaskstatus" headerText="Status Change *" width="200"
                       editable="true" editorDataField="value">
                      <mx:itemRenderer>
                            <mx:Component>
                                  <mx:ComboBox color="#000000">
                                        <mx:dataProvider>
                                              <mx:String>FW</mx:String>
                                              <mx:String>AW</mx:String>
                                              <mx:String>CA</mx:String>
                                              <mx:String>OA</mx:String>
                                              <mx:String>RE</mx:String>                                              
                                        </mx:dataProvider>
                                  </mx:ComboBox>
                            </mx:Component>
                      </mx:itemRenderer>
                </mx:DataGridColumn>
   </mx:columns>
</mx:DataGrid>