DataGrid Sort Clears HeaderRenderer Checkbox

Question

I have a datagrid that I defined a checkbox as the
headerrenderer for one of the columns. It took me a while to track
this down, but it seems like a re-sort on one of the columns (other
than the checkbox headerrenderer column) clears the state of the
checkbox and resets it to chexkbox.selected=false.
Is there any way to persist the checkbox selected property of
a headerrenderer checkbox instance on re-sort.
I played with disabling the default sort methods and creating
my own sort functionality by only allowing a specific column to be
sorted. That didn't solve my problem though.
Thanks,
JB

Answer 1

I did something similar with my DataGrid. The way I solved
the problem was to make a global variable to hold the checkBox's
checked value and then on the checkbox's click event ran a global
function to handle the setting of the global var:
<mx:DataGridColumn id="copyColumn" dataField="check"
width="35">
<mx:headerRenderer>
<mx:Component>
<mx:HBox horizontalAlign="center"
verticalAlign="middle">
<mx:CheckBox id="check"
tabIndex="1" labelPlacement="top" selected="
{outerDocument.check_flg}"
click="
outerDocument.checkAll(check.selected)" height="18" />
</mx:HBox>
</mx:Component>
</mx:headerRenderer>
</mx:DataGridColumn>
note that the above code is contained in a component that
extends mx:DataGrid
I think you can get the jist...