ExtJs4 - What is the equivalent to the grid ColumnModel?

Question

What is the equivalent to the ExtJs3 Ext.grid.ColumnModel in ExtJs4?

What I want to do is hide a column, I did something like below in ExtJs3:

Answer 1

The other answers can be problematic if your column indexes change.

Here is another solution:

Set itemId on the column definition:

{
        itemId: 'myActionColumn',
        xtype: 'actioncolumn',
        width: 50,
        items: [ ...
}

Then to hide:

grid.down('#myActionColumn').hide();