Flex users may get this error message quite a lot of times. That error message can pertain to either a method or a property. The cause? I came upon this problem because I used an inline Item Renderer for a DataGrid Column. I tried to access a variable not within the DataGrid component. This is because your Inline Item Renderer does not know what exists in your main application. Take this sample

This took me awhile to locate a solution. Luckily there is. Using outerDocument to call methods and/or variables will solve the problem. e.g. outerDocument.method_name()

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