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<TextBox>
<TextBox.ToolTip>
<ToolTip Placement="Bottom"
Content="Some ToolTip Content">
<ToolTip.Triggers>
<EventTrigger RoutedEvent="ToolTip.Opened">
<BeginStoryboard>
<Storyboard TargetProperty="Opacity">
<DoubleAnimation From="0.0" To="1.0" Duration="0:0:2" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</ToolTip.Triggers>
</ToolTip>
</TextBox.ToolTip>
</TextBox>