<Canvas xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
<Button>
OK
<Button.Triggers>
<EventTrigger RoutedEvent="Button.Click">
<EventTrigger.Actions>
<BeginStoryboard>
<Storyboard TargetProperty="Width">
<DoubleAnimation From="50" To="100"
Duration="0:0:5" AutoReverse="True"/>
</Storyboard>
</BeginStoryboard>
</EventTrigger.Actions>
</EventTrigger>
</Button.Triggers>
</Button>
</Canvas>
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