how to use combo box without a context

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Hi I am build a Garment room app where user can select destination rack and multiple garment to change the rack of selected garments.   However when I run the app it throws this error: 'valueAttribute' is not defined Error: 'valueAttribute' is not defined    Please advise how to properly use combo box here?  
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1 answers
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Ethan,

It seems to me that you have not passed a GarmentRack object (or passed an empty GarmentRack object) to the page.  How did you open the page?  How did you get the GarmentRack object you passed to the page?

Mike

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