You could add a column renderer and then add styling to the cell depending on a value in the store.
See http://docs.sencha.com/ext-js/4-1/#!...n-cfg-renderer
For example, lets say you have a record value of "deleted" in your store and you want to add a red border to the cell in that column when the deleted value is true you would do something like this:
Code:
renderer: function(value, metaData, record) {
if (record.get('deleted')) {
metaData.style = 'border: 3px solid red;';
}
return value;
}
You can also use metaData.tdCls to attach a class to the td element.