how t ochange the default functionality of editFirstCellInRow

[EPM Solutions]

Here I have question regarding , whenever i use editFirstCellInRow after entering the value and pressing enter js highlights next adjacent cell of next column. Here I want to change it to lower cell in same column instead on next column.

EX: 

[paramvir]

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[EPM Solutions]

Thank you for the answer, here I need one more option, if I press shift+tab, it should go previous cell as well.

[paramvir]

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[EPM Solutions]

yes it is working,

but here we have requirement like, we have done row grouping. so am getting stuck because group header row is not editable. so once the cursor comes to group header row it will not go further if I click enter button. Can I get the solution for that.

i have attached the Image below group header is mentioned using yellow color, and others cells are particular column is editable. and one requirement like, once it reaches Last row if I press enter it should come first editable cell of that particular column.

[paramvir]

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