The example represents how to customize the appearance of the rows being edited, using the EditItemStyle property. Below is a code extraction from the ASPX related to this matter:

<EditItemStyle CssClass="EditedItem" Height="25px"></EditItemStyle>

<style type="text/css">
.EditedItem, .EditedItem TABLE TR
{
background-color: #ffffe1;
background-image: none;
}
</style>

You can also alter the GridEditRow_[SkinName] class for the corresponding skin applied for the control (residing in the RadControls/Grid/Skins folder). For the Default grid skin the class definition is presented in the next paragraph:

.GridEditRow_Default td
{
/* your definitions here */
}

Note that you can change the command item and filter item appearance through the GridCommandRow_[SkinName] and GridFilterRow_[SkinName] css classes for the chosen grid skin.

Additional details about how to modify existing grid skins are avaialable in the relevant topic from the product online documentation:
Modifying grid skins