I dont have vault but the api taskbar commands can be found here: Link 1
Heres a good video on ilogic for vault: Link 2
Something like this might work. It uses the Chr functions to send keys. 9 = tab, 10 = enter
ThisApplication.CommandManager.ControlDefinitions("VaultReviseTop").Execute
System.Windows.Forms.SendKeys.SendWait(Chr(9) & Chr(9) & Chr(9) & "ECN#" & Chr(9) & Chr(10))