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Bug SDK-11198 is a duplicate of http://bugs.adobe.com/jira/browse/SDK-10979 and this has been fixed in Flex SDK build 174773. There is a Flex SDK nightly build available for you to try.
Go to: http://labs.adobe.com/technologies/flex/sdk/flex3sdk.html
Download the most recent nightly build and use that to see if the runtime error you are getting has been fixed.
Suddenly started getting this bug again. Wasn't sure if it was a new version of the Flash Player or whether somehow my SDK was updated.
Downloaded & compiled with a later SDK version (180027) and get a similar error, for both my existing SDK version & the newer version:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at mx.controls::DataGrid/mx.controls:DataGrid::focusInHandler()[E:\dev\flex_3_beta1\sdk\fram eworks\projects\framework\src;mx\controls;DataGrid.as:3909]
at flash.display::Stage/set focus()
at mx.core::UIComponent/setFocus()[E:\dev\flex_3_beta1\sdk\frameworks\projects\framework\src ;mx\core;UIComponent.as:6366]
at mx.managers::FocusManager/setFocus()[E:\dev\flex_3_beta1\sdk\frameworks\projects\framewor k\src;mx\managers;FocusManager.as:394]
at mx.managers::FocusManager/mx.managers:FocusManager::mouseDownHandler()[E:\dev\flex_3_beta 1\sdk\frameworks\projects\framework\src;mx\managers;FocusManager.as:1360]
Just questioning this again. Quite urgently need header renderers to work. Any idea why the bug is back? Compiled my project with the 182105 build & still got the error.
I'm the filer of that bug. I've just confirmed that the bug file attached to it still shows that the bug is fixed in build 182702. If you are still getting the error, could you please attach your source code to the bug and ping me?
Tested this again and the bug no longer appears.