ToolTipService.Placement="Bottom"
<Window x:Class="ClassicControls.Tooltips" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Tooltips" Height="321" Width="301" > <StackPanel Margin="5" ToolTip="StackPanel tooltip"> <Button ToolTip="This is my tooltip" ToolTipService.Placement="Bottom">Placement test</Button> </StackPanel> </Window>