Adding fixed Gridlines Chart in Flex

Is anyone know how to adding fixed gridlines chart in flex, for example: I have a vertical axis which has a minimum value 0 and the maximum value 100 but I only want to display gridlines on va开发者_高级运维lues 30 and 70. So please me.... thx

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This should work... might not be ideal for you but it's simple...

Set the minimum to -10 the maximum to 110 and the interval to 40 on the verticalAxis.

http://help.adobe.com/en_US/flex/using/WS2db454920e96a9e51e63e3d11c0bf69084-7c24.html#WS2db454920e96a9e51e63e3d11c0bf65a29-7fec