Dear pthomas,

 

You can refer to: http://cutesoft.net/example/customization.aspx , this example show you how to add customization button. In installation package, you can find the source of this example. Dropdown list is same as button customization.

You can also refer to online document: http://cutesoft.net/developer+guide/index.htm#page=Add_your_own_custom_button.htm 

 

 

Regards,

Eric