ExtJs 4: How do I hide/show grid columns on the fly?

Question

I need to show/hide columns of a grid on the fly, but it seems that ExtJs 4 has no implemented method for that.

In previous versions I should use columnModel, what d

Answer 1

Ext.getCmp('gridId').columnManager.getColumns()[index].hide();
Ext.getCmp('gridId').doLayout();

This works for me