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my bad, apparently the list.addMarkAllButtons() doesn't exist for inline editor. no idea why.

well that's weird. also from the api doc:
var form = serverWidget.createForm({
title : 'Simple Form'
});
var sublist = form.addSublist({
id : 'sublist',
type : serverWidget.SublistType.INLINEEDITOR,
label : 'Inline Editor Sublist'
});
sublist.addMarkAllButtons();