Display problem of grid Control of ExtJS2.2.1 in ie6 _ extjs

I recently learned how to use ExtJS for rich client development. When using the grid Control of ExtJS2.2.1, it is found that there is a problem in ie6 running, as shown in:

The Menuitem icon overwrites the text, so the display effect is unpleasant.

Check the previous version (2.2) and find that this problem does not exist.

Therefore, compare the 2.2.1 and 2.2 versions, found that there are differences in resources/css/ext-all.css related styles, such:

You can solve this problem by modifying the two styles of version 2.2.1. After modification, it can be normally displayed on ie6, for example:

In addition, opera9.5 and Firefox3.0.10 can be properly displayed.

ExtJS's latest version 3.0 RC1 has no such problem.