This is how non-updatable fields are displayed by default. The gray is applied because the default disabledClass is x-item-disabled which is {color:gray}. You can either set disabled:true or disabledClass to something other than x-item-disabled.

e.g. {name:'DM', disabledClass:''}

I think that should do it.

see also

http://www.extjs.com/deploy/ext-2.2.1/docs/?class=Ext.form.TextField