Ive tested my code with your example but it doesnt seems to work with a
System.Web.UI.WebControls.DropDownList
Since the method is called "RegisterCustomButton" maybe its "normal"
DropDownList1 = New System.Web.UI.WebControls.DropDownList
DropDownList1.Items.Add("Test")
DropDownList1.ID =
"MyTest"
Editor1.RegisterCustomButton(DropDownList1)
Any other way I could add DropDownList1 to the end of the toolbar...