I get a Run-Time Error #1010 on my datagrid control when I scroll vertically. The problem would not happen everytime so I was having a hard time fixing it. This is the exact error message I would get.
TypeError: Error #1010: A term is undefined and has no properties. at mx.controls.listClasses::ListBase/mx.controls.listClasses:ListBase::sc rollVertically() [C:\dev\GMC\sdk\frameworks\mx\controls\listClasses\ListBase.as:5260] at mx.controls::DataGrid/mx.controls:DataGrid::scrollVertically() [C:\dev\GMC\sdk\frameworks\mx\controls\DataGrid.as:1887] at mx.controls.listClasses::ListBase/set verticalScrollPosition() [C:\dev\GMC\sdk\frameworks\mx\controls\listClasses\ListBase.as:1018] at mx.controls::DataGrid/mx.controls:DataGrid::scrollHandler() [C:\dev\GMC\sdk\frameworks\mx\controls\DataGrid.as:1694] at flash.events::EventDispatcher/flash.events:EventDispatcher::dispatchEv entFunction() at flash.events::EventDispatcher/dispatchEvent() at mx.controls.scrollClasses::ScrollBar/http://www.adobe.com/2006/flex/mx /internal::dispatchScrollEvent() [C:\dev\GMC\sdk\frameworks\mx\controls\scrollClasses\ScrollBar.as:1095 at mx.controls.scrollClasses::ScrollBar/http://www.adobe.com/2006/flex/mx /internal::pageScroll() [C:\dev\GMC\sdk\frameworks\mx\controls\scrollClasses\ScrollBar.as:1079 at mx.controls.scrollClasses::ScrollBar/mx.controls.scrollClasses:ScrollB ar::scrollTrack_mouseDownHandler() [C:\dev\GMC\sdk\frameworks\mx\controls\scrollClasses\ScrollBar.as:1215 ] I know now that my itemRenderer on my datagrid columns is causing this error. Depending on the columns return from my remote call I determine if a specific column is to use the item renderer. if( col.allowFilter ) { trace("Execute ItemRenderer!"); filterRenderer = new ClassFactory(ColumnFilterRenderer); filterRenderer.properties = {dataField: name }; newColumn.itemRenderer = filterRenderer; newColumn.rendererIsEditor = true; } I looks like the datagrid gets confused and how many rows there are to renderer. I can reproduce the problem like so: 1. I click on a node in a Tree control which loads 50 rows into my datagrid causing it to scroll vertically. I can scroll these results fine. 2. I click on a node in a Tree control which loads more then 50 rows into my datagrid causing it to scroll vertically. If I try to scroll I get the run-time error. So I can reproduce the error only if I load a small result set that scrolls then load a larger result set that scrolls. If I load a large result set first then a smaller one I don't get the run-time error. If I load a small result set that scrolls then one that does not then a large one that does I don't get the error. I think the listItems variable in the ListBase class is getting confused on how many itemRenderers it needs to actually render.
