property ComboBox.FilterForBackColor as Color
Retrieves or sets a value that indicates the FilterFor's background color.

TypeDescription
Color A Color expression that specifies the color to fill the FilterFor field. The last 7 bits in the high significant byte of the color to indicates the identifier of the skin being used. Use the Add method to add new skins to the control. If you need to remove the skin appearance from a part of the control you need to reset the last 7 bits in the high significant byte of the color being applied to the background's part. 
By default, the control's BackColor property indicates the FilterFor field. Use the FilterForVisible property to display a text box editor in the bottom side of the drop down portion of the control to allow filtering items in a different way. The FilterForForeColor property specifies the forecolor for the FilterFor field. The height of the FilterFor field is determined by the control's FilterBarFont property. The control fires the EditChange(-1) event when the user alter the text in the FilterFor field. The -1 parameter indicates the FilterFor field. Use the EditText(-1) property to specify the text being displayed in the FilterFor field.