![Avatar](https://secure.gravatar.com/avatar/5c6cc5195ca3ed90ef444d6ba31eb9ac.jpg?s=64&d=identicon&r=g)
I put a ribbon button inside a Windows Toolbar like below
<ToolBar DockPanel.Dock="Top">
<ribbon:Button Label="Save" VariantSize="Small" ToolTip="This should only be the Tooltip">
<ribbon:Button.ImageSourceSmall>
<BitmapImage UriSource=".\Resources\Images\16\Save_16x16.png" />
</ribbon:Button.ImageSourceSmall>
</ribbon:Button>
</ToolBar>
If you hover it, after around 1-2sec, you will see two tooltips on top of one another. One is the assigned Tooltip and the other is the Label value.