Button.Tooltip TextBlock.Tooltip Binding
<TextBlock VerticalAlignment="Center" Text="{Binding FileName, StringFormat={inf:Resource Importing_FilePath}, TargetNullValue={inf:Resource PleaseSelectFile}}">
<TextBlock.ToolTip>
<ToolTip Content="{Binding FileName}" FontSize="8" />
</TextBlock.ToolTip>
</TextBlock>
