SGWT 5 - missing icons in grid submenu

Hi,

After switching to SGWT 5 I've noticed a problem with displaying icons in the menu item when it's attached to the ListGrid's header menu.

Version: 5.0 pro (build: 2015-07-29)

Screenshots are in attachments and an example code is here. It contains two cases:

a) a submenu in the grid's header menu (missing icons)
b) the same submenu outside the grid (icons are correctly displayed)

It was tested under Chrome, but I don't think it's a browser problem, because case a) works under SGWT 4.1 on the same browser.

Is there a way to fix it in SGWT 5?

Attached Images

	SGWT-4-1.png (23.8 KB)
	SGWT-5-0.png (22.2 KB)