How do I create a multiline tooltip for a basecommand in a toolbar ?

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VB

toolbar

ToolTip

Hi experts,
I'm trying to find a possibility to add a "CrLf" to the tooltip property for a command button (BaseCommand) on a toolbar (not on a form, this is easy with the tooltip from the toolbox!)
I tried vbCrLf, ControlChars.CrLf, "<br \>" and Environment.NewLine in the tooltip-string. But there is no reaction, the tooltip ignores it all, he does what he wants.
Has anyone an idea ?

This is the tooltip property section of my command:

Public Overrides ReadOnly Property Tooltip() As String

    Get
        MyBase.m_toolTip = "my first line" & vbCrLf & "and now the second line"
        Return MyBase.Tooltip
    End Get

End Property