how to move tab indexes between widget columns only?

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Gridview

ExtJS

I am working on Extjs 5 widget columns. How can i move the focus on tab press to next widget column? i have two widget columns in my gridview and each contains a textfield. keyup event is working fine. i want to move the focus to next widget column's textfield of same row on keyup event.

onMytextfieldKeyup: function(textfield, e, eOpts) {

  //what to do

}