How to add color picker in a row of Ext.grid.GridPanel

I'd like to use a color picker when I edit some cells in a row of an Ext.grid.GridPanel. I didn't find any examples fro开发者_如何转开发m the official Examples or the APIs, could someone give me some example codes for this case, any suggestions will be appreciated!

There is plugin on sencha forum for extjs3. It seems that you can use it as an editor for your grid.