Here is an example of animating on mouseover:
<Trigger Property="IsMouseOver" Value="True">
<Trigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation
Storyboard.TargetName="Border"
Storyboard.TargetProperty="Opacity"
To="1"
Duration="0:0:0.1" />
</Storyboard>
</BeginStoryboard>
</Trigger.EnterActions>
</Trigger>
Also, check out this link Storyboard Class[^]
Regards, Lev