WPF - ListBoxItem alternating background and story board - wpf

Question

for a WPF prototype I would like to accomplish the following:
I want display a listbox where each item looks like "Text Button1 Button2". All the 3 of them are bound to an Observable collection. Text displays a string, Button1 and Button2 display a double. SO far no problem. I would like to extend the functionality as follows and have no idea in how to accomplish this in the best possible practice:
1) The entries in the listbox should have an alternating background, based on the index. ie
If (index % 2) == true, then background = red,
else background = green.
The index might change and the background should update automatically.
2) If the value of double bound to the button text increases, the button should be highlighted green for a second,
else if the value of the double bound to the button text decreases, the button should be highlighted red for a second,
else the button should do nothing.
Can someone help me?
Thanke, br
// edit:
For #2 I now tried the following: Having 2 Storyboards, bound to data triggers. My problem is, that it does not highlight do each of the triggered changes Any ideas?
<Storyboard x:Key="ValueDecreaseAnimationStoryBoard" Name="ValueDecreaseAnimationStoryBoard">
<ColorAnimation
Storyboard.TargetProperty="(Background).(SolidColorBrush.Color)"
To="Red"
AutoReverse="True"
Duration="0:0:0.5" />
</Storyboard> <Storyboard x:Key="ValueIncreaseAnimationStoryBoard" Name="ValueIncreaseAnimationStoryBoard">
<ColorAnimation
Storyboard.TargetProperty="(Background).(SolidColorBrush.Color)"
To="Green"
AutoReverse="True"
Duration="0:0:0.5" />
</Storyboard>
<Style x:Key="ValueTriggerStyle" TargetType="{x:Type Button}">
<Setter Property="Background">
<Setter.Value>
<SolidColorBrush Color="LightGray" />
</Setter.Value>
</Setter>
<Style.Triggers>
<DataTrigger Binding="{Binding Path=Value1Trend}" Value="{x:Static local:Trend.Decreased}">
<DataTrigger.EnterActions>
<BeginStoryboard Storyboard="{StaticResource ValueDecreaseAnimationStoryBoard}" />
</DataTrigger.EnterActions>
</DataTrigger>
<DataTrigger Binding="{Binding Path=Value1Trend}" Value="{x:Static local:Trend.Increased}">
<DataTrigger.EnterActions>
<BeginStoryboard Storyboard="{StaticResource ValueIncreaseAnimationStoryBoard}" />
</DataTrigger.EnterActions>
</DataTrigger>
</Style.Triggers>
</Style>