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    <p>You can easily toggle the visibility of the whole column when rolling over items in column1 that way:</p> <pre><code>&lt;mx:DataGrid dataProvider="{[{c1:'a1', c2:'b1', c3:'c1'}]}"&gt; &lt;mx:columns&gt; &lt;mx:DataGridColumn headerText="Column 1" dataField="c1"&gt; &lt;mx:itemRenderer&gt; &lt;mx:Component&gt; &lt;mx:Label text="{listData.label}" rollOver="DataGrid(owner).columns[2].visible = true" rollOut="DataGrid(owner).columns[2].visible = false" &gt; &lt;mx:Script&gt; &lt;![CDATA[ import mx.controls.DataGrid; ]]&gt; &lt;/mx:Script&gt; &lt;/mx:Label&gt; &lt;/mx:Component&gt; &lt;/mx:itemRenderer&gt; &lt;/mx:DataGridColumn&gt; &lt;mx:DataGridColumn headerText="Column 2" dataField="c2" /&gt; &lt;mx:DataGridColumn headerText="Column 3" dataField="c3" visible="false" /&gt; &lt;/mx:DataGrid&gt; </code></pre> <p>Of course, you'd better create new class instead of inline item renderer.</p> <p>Showing the only renderer in the 3rd column is very tricky, because if the whole column is invisible, then no renderers for that column is created. </p> <p>I think it's better to use tooltip-like solution, like this:</p> <pre><code>&lt;mx:Script&gt; &lt;![CDATA[ import test.CellRenderer; ]]&gt; &lt;/mx:Script&gt; &lt;mx:UIComponent id="textFlowContainer" width="100%" height="100%" /&gt; &lt;mx:DataGrid dataProvider="{[{c1:'a1', c2:'b1', c3:'c1'}]}"&gt; &lt;mx:columns&gt; &lt;mx:DataGridColumn headerText="Column 1" dataField="c1" itemRenderer="{new ClassFactory(CellRenderer)}" /&gt; &lt;mx:DataGridColumn headerText="Column 2" dataField="c2" itemRenderer="{new ClassFactory(CellRenderer)}" /&gt; &lt;/mx:columns&gt; &lt;/mx:DataGrid&gt; </code></pre> <p>Where test.CellRenderer is:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;mx:Label xmlns:mx="http://www.adobe.com/2006/mxml" text="{listData.label}" rollOver="rollOverHandler()" rollOut="rollOutHandler(event)"&gt; &lt;mx:Script&gt; &lt;![CDATA[ import mx.managers.PopUpManagerChildList; import mx.managers.PopUpManager; import mx.controls.Label; import mx.controls.DataGrid; private var popupLabel:Label; private function rollOverHandler ():void { popupLabel = new Label(); popupLabel.addEventListener(MouseEvent.ROLL_OUT, rollOutHandler); popupLabel.text = data.c3; PopUpManager.addPopUp(popupLabel, this, false, PopUpManagerChildList.PARENT); var p1:Point = new Point(0, this.y); p1 = localToGlobal(p1); var p2:Point = new Point(listData.owner.x+listData.owner.width, 0); p2 = listData.owner.parent.localToGlobal(p2); popupLabel.move(p2.x, p1.y); } private function rollOutHandler (event:MouseEvent):void { if (popupLabel &amp;&amp; !popupLabel.hitTestPoint(event.stageX, event.stageY)) { PopUpManager.removePopUp(popupLabel); popupLabel = null; } } ]]&gt; &lt;/mx:Script&gt; &lt;/mx:Label&gt; </code></pre>
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    1. COThanks,Nikita! I'm not sure about the second approach,but the first one is not quite I want,what I want is just show one cell,not the whole column. I will try the second way,see if that works.
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    2. COThe second approach still has problem.In fact,I want show some buttons at end of the certain row,so people must can click it.But when mouse over the button,rollOutHandler make it disappear immediately。
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    3. COI've edited my solution to handle this situation.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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