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Been having problems for my itemRenderers in datagrids. I am using Button control as a itemRenderer and setting their visibility based on their labels. Somehow, the buttons becomes visible when my DataGrid dataprovider is changed. 

The reference below solved my problem. I needed to place my logic to set the visible variable in the right place. Rest of the article touches on efficiency.

Reference: Peter Ent - itemRenderers: Part 5: Efficiency

What happens if you want to make your DataGrid editable but you want to restrict which rows are editable?

<mx:DataGrid dataProvider="{mx.utils.ArrayUtil.toArray(someModel)}" editable="true" 

itemEditBeginning="onItemBeginning(event)">

<mx:columns>

<mx:DataGridColumn dataField="name" headerText="" width="100"/>

<mx:DataGridColumn dataField="hole1" headerText="1" width="50" editable="true" itemEditor="mx.controls.NumericStepper" editorDataField="value"/>

</mx:columns>

</mx:DataGrid>

private function onItemBeginning(event:DataGridEvent)

{

var item:Object = event.itemRenderer.data; //Does nothing

if (event.rowIndex == 0)

{

event.preventDefault();

}

}

Reference:

• http://flexblog.faratasystems.com/?p=127