The following code show you how to add items to the style dropdown list.

dim temp_styledropdownMenuNames

//style drop down name array
temp_styledropdownMenuNames = "Heading,Head,Subhead,NormalRed,Comment"

//style drop down css class array
temp_styledropdownMenuList = "class1,class2,class3,class4,class5"

//pass the array to the editor

editor.StyleDropDownMenuNames = temp_styledropdownMenuNames
editor.StyleDropDownMenuList = temp_styledropdownMenuList

You also can find the sample code in the enableall.asp

The editor asp version doesn't support add a customized button yet. Sorry for the inconvenience.