Problem with Checkbox ItemRenderer in a DataGrid

Question

Hello Everyone,
I'm using a datagrid with two columns, which is used as a data entry grid. The first column has a simple text input field and the 2nd column has a checkbox as an itemrenderer. On creationComplete event, I'm passing an arraycollection as the dataprovider for this datagrid. The arraycollection:
<mx:ArrayCollection id="psAC">
        <mx:source>
            <mx:Array>
                <mx:Object PaText="line1" PaCheckbox="0" />
                <mx:Object PaText="line2" PaCheckbox="0" />
                <mx:Object PaText="line3" PaCheckbox="1" />
                <mx:Object PaText="line4" PaCheckbox="0" />
                <mx:Object PaText="line5" PaCheckbox="0" />
            </mx:Array>
        </mx:source>
    </mx:ArrayCollection>
There is a datagrid (dGa) in the main application. On click of this, a pop up window comes up which has the same datagrid layout(i.e, 2 columns). And this is where the data is entered. Here, if the user checks the check box, I have assigned a value of '1' for the 2nd column of the arraycollection. THis code(below) works fine.
<datagrid in pop up window>
<mx:DataGridColumn headerText="Best Possible Action?" textAlign="center" width="200" editable="false">
                            <mx:itemRenderer>
                                <mx:Component>
                                   <mx:CheckBox>
                                        <mx:Script>
                                                <![CDATA[
                                                     override public function set data(value:Object):void{
                                                         if(value.PaCheckbox == 1){
                                                            this.selected = true;
                                                        }else{
                                                            this.selected = false;
                                                ]]>
                                            </mx:Script>
                                        <!--<mx:change>
                                            <![CDATA[
                                                if(this.selected == true){
                                                     data.PaCheckbox = 1;
                                                 }else{
                                                     data.PaCheckbox = 0;
                                            ]]>
                                        </mx:change>-->
                                    </mx:CheckBox>
                                </mx:Component>
                            </mx:itemRenderer>
                        </mx:DataGridColumn>
But I would also need to set the PaCheckbox value to 0 or 1, based on teh check condition of the check box. I tried using change event (commented in the code above). But there I get an error: Cannot access a property or method of a null object reference. I checekd in debug mode, there the data object is null! Can you please help me on how to pass back the values(0 o 1) to my arraycollection, based on the checkbox's status?
Cheers,
Deepak

Answer 1

heyo,
I solved it.....
i was missing this line of code super.data = value; in the ovverriden function...Once we have this line, the data object will have teh field names and their values in it, which can be accessed on the change event...