Vista - Can trigger work outside a style ?

I'm really confused, I have a Stack Panel

Inside it there is a StackPanel.Triggers section

which is declared as

<StackPanel.Triggers>
<EventTrigger RoutedEvent="ToggleButton.Checked"
SourceName="ResizeButton">
<EventTrigger.Actions>
<BeginStoryboard Storyboard="{StaticResource ExpandCart}"
x:Name="ExpandCart_BeginStoryboard"/>
</EventTrigger.Actions>
</EventTrigger>
<EventTrigger RoutedEvent="ToggleButton.Unchecked"
SourceName="ResizeButton">
<EventTrigger.Actions>
<BeginStoryboard Storyboard="{StaticResource ShrinkCart}"
x:Name="ShrinkCart_BeginStoryboard"/>
</EventTrigger.Actions>
</EventTrigger>
<EventTrigger RoutedEvent="ToggleButton.Checked"
SourceName="InStorePickupButton">
<EventTrigger.Actions>
<Setter Property="Visibility" Value="Visible"
TargetName="InStorePickupOptions"/>
</EventTrigger.Actions>
</EventTrigger>
<EventTrigger RoutedEvent="ToggleButton.Checked"
SourceName="ShipToButton">
<EventTrigger.Actions>
<Setter Property="Visibility" Value="Visible"
TargetName="ShipToOptions"/>
</EventTrigger.Actions>
</EventTrigger>

</StackPanel.Triggers>

The above fails miserably since .NET decides that Visibility can't be
set because it's a DependentProperty.

However, the following in the same page works

<ControlTemplate.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter Property="Visibility" Value="Visible" TargetName="Action" />
<Setter Property="Foreground" Value="#ffffffff"/>
</Trigger>
<Trigger Property="IsSelected" Value="False">
<Setter Property="Visibility" Value="Collapsed"
TargetName="Action" />
</Trigger>
</ControlTemplate.Triggers>


The difference is that one acts on the ControlTemplate of one of the
control and the other works on the whole page. Why can't I apply the
same kind of behavior that I use on a control template inside a page?

Please help

Phil

The first thing I can see that might be wrong about this is that
"Trigger" class uses a collection os "SetterBase" and "EventTrigger"
use a collection of "TriggerAction" as their content properties...

This mean that normally, "Setter" is not a valid item for the
"EventTrigger" class.

You could try to place a trigger onto a DP in your custom StackPanel
declaration that would perform the same function as your "Checked" or
"Unchecked"...

Marcus