With custom item style you can specify special style for particular item in your menu system.

menu theme: mystic
To specify custom item style:

[menu].setItemStyle("item id", "spc1_"); // spc1_ is the style prefix.

In stylesheet, define set of class rule with the prefix. There are 8 class rule you can use for custom item style.

.spc1_nlsitemcontainer {}
.spc1_nlsiconcell {}
.spc1_nlsitem {}

.spc1_nlsitemcontainerover {}
.spc1_nlsiconcellover {}
.spc1_nlsitemover {}