FormItem
has method setCellStyle()
to set the style of specific cell.
Use
myTextItem.setCellStyle("myTextItemHint");
your CSS will look like this:
.myTextItemHint, .myTextItemHint input {
color: gray;
}
Override other properties also if needed
.textItem,.textItemFocused,.textItemDisabled,.textItemDisabledHint,.textItemError,.textItemHint
For more information on CSS, Please have a look at skin_styles.css
that is already shipped along with standard skins in SmartGWT.