c# - VS 2013 SDK: How to add a line separator in a CommandBarPopup menu? -

in c# or else vb.net, using visual studio package, how add separator line commandbarpopup menu?.

i've tried solution given @carlos j. quintero in question:

how insert separator line between multiple add-in commands in menu command bar?

using code:

    private sub addseparatorline(byref cmndbarpopup commandbarpopup,                                  byval index integer)          dim tempcommandbarbutton commandbarbutton =             directcast(cmndbarpopup.controls.add(msocontroltype.msocontrolbutton, missing.value, missing.value, index, true), commandbarbutton)          tempcommandbarbutton              .begingroup = true             .visible = true             .enabled = false         end      end sub 

however, adds blank space (a button without name) separator, isn't separator line.

this kind of separator line expect:

but got:

creating user interface packages totally different creating add-ins. packages done in .vsct file. line separators separate groups, if want line separator need declare new group. see how create reusable groups of buttons.