Yes, it is there, and no there is not a problem with the install. First, you must inherit from the RTT and override the properties.
Public Class MyRTT
Inherits MicroFour.StrataFrame.UI.Windows.Forms.RichTextToolstrip
Public Overrides Readonly Property BoldTooltipText as String
Get
Return "Your text"
End Get
End Property
End Class
You will obviously need to repeat this for the other properties as well.