How to set my Outlook Context Menu on top position

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C#

VSTO

Outlook

AddIn

Hi friends,

I am trying to add a context menu for my contact Item in an Outlook Addin Project..
But the Menu appears at the bottom...
How can I set it as first Item in Menu... ?

var contextButton = commandBar.Controls.Add(Office.MsoControlType.msoControlButton, missing, missing, 0, true) as Office.CommandBarButton;

Please Help me ....