See 
PublishedAPI for packages intended to be used by Plugin and Contrib authors, or 
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See also 
Developing plugins, 
Developer's Bible, 
Technical Overview
 ObjectMethod editor($cell, $colDef, $inRow, $unexpandedValue) 
Generate an HTML editor for the cell
Generate JQuery metadata for the cell
 ObjectMethod forceValue() 
Called when a value is being loaded into the internal table from url
params; gives an opportunity for the type to override the value (e.g. for
a generated value, or for a label)