Ext modifies GridPanel data and font colors CSS properties and so on

Ext modizes GridPanel data, font colors, etc., not just the EditGridPanel

First, get the selected row (or cell, of course) :

 
var selectedRow = grid.getSelectionModel().getSelected(); 

Modify Settings:

 
selectedRow.set("key","value"); 

To modify the background color, first get the line number, and then get the view object of the line:

 
var selectedIdx = grid.store.indexOf(selectedRow); 
var selectedView = grid.getView().getRow(selectedIdx); 

Modify the CSS properties of the line:

 
selectedView.style.color="#FF0000"; //The font becomes red