Ext Js image assets when AIR application is offline

[mudittuli]

Whenever I take my application offline I get these '?' (marked with red quads in image)for the drop downs icons in combo-box and other assets, may be the image assets are being retrieved from extjs.com.
How can I fix this ?, i am using Ext Js 2.0.2

[RobSmith]

Set the blank image "constant" to an image stored locally e.g.

Ext.BLANK_IMAGE_URL = 'mymedia/s.gif';

This must be declared at the beginning of your code.