The feature 5850 changed widgetVar's scope,
removing them from window to new function PF('widgetVar').
// instead
myWigetVar.samplemethod();
// use
PF('myWidgetVar').samplemethod();
// or
var myWidgetVar = PF('myWidgetVar');
myWigetVar.samplemethod();
It's a feature that ended up coming down from upstream version not intentionally. Therefore, it will be removed in the 3.5.11-UR release.