Am I able to use prepareData?

[bseddon]

When using ExtJS I am able to use the prepareData method to modify variables before they are applied to a template. The Touch dataview documentation indicates there is a prepareData method but when I create a 'Basic Function' as I do when using ExtJS the designer reports

A valid function must have fn set. In addition, a function of a non top level component must match a configuration.

Is it possible to use prepareData? Should I create an override?

Thanks

[bseddon]

I answered my own question. The component must be promoted to a class.

[aconran]

Yes, this is a departure from Ext JS, but is the only way that it is possible in Sencha Touch.

(It's purposefully enforced that you can't override methods at the instance level)