Alex, 

Thanks that helped and you answered quickly as well, but I still ran into problems.

Your answer closed off what the property item syntax was for the Target. I got it to work, still using a DataTrigger. 

The source code I have is rather large. In summary, to get the DataTrigger to fire when DataItem.IsNew = true, is just on a object that implements INotifyPropertyChanged  like this:

public sealed class Dummy : INotifyPropertyChanged
 {
  private bool? m_isNew = true;

  public bool? IsNew
  {
   get
   {
    return m_isNew;
   }
   set
   {
    if (value != m_isNew)
    {
     m_isNew = value;
     OnPropertyChanged("IsNew");
    }

   }
  }

  #region INotifyPropertyChanged Members

  public event PropertyChangedEventHandler PropertyChanged;

  protected void OnPropertyChanged(string propertyName)
  {
   var propertyChangedEventArgs = new PropertyChangedEventArgs(propertyName);

   if (PropertyChanged != null)
   {
    PropertyChanged(this, propertyChangedEventArgs);
   }
  }

  #endregion

 }

 The xamDataGrid is then just bound to a ObservableCollection<Dummy> instance.

In the Xaml, after changing the target from "Background" to "Background.Color" I still kept getting this error when an item was added to the grid:

"Cannot resolve all property references in the property path 'Background.Color'. Verify that applicable objects support the properties."

I then changed the xaml so the DataTrigger only fires when IsNew = False. Not intuitive but just testing.  The XamDataGrid then displayed correctly as the storyboard is not activated.

VirtualizingStackPanel.VirtualizationMode="Standard"

IsGroupByAreaExpanded="False">

<igDP:XamDataGrid.Resources>

<Storyboard x:Key="storyboard1">

Storyboard.TargetProperty="Background.Color"

Duration="0:0:6" FillBehavior="Stop" RepeatBehavior="2x">

<ColorAnimationUsingKeyFrames.KeyFrames>

<LinearColorKeyFrame Value="Blue" KeyTime="0:0:5" />

<LinearColorKeyFrame Value="White" KeyTime="0:0:5" />

</ColorAnimationUsingKeyFrames.KeyFrames>

</ColorAnimationUsingKeyFrames>

</Storyboard>

<Style TargetType="{x:Type igDP:DataRecordPresenter}">

<Style.Triggers>

<DataTrigger Binding="{Binding Path=DataItem.IsNew}" Value="False">

<DataTrigger.EnterActions>

<BeginStoryboard Storyboard="{StaticResource storyboard1}" x:Name="newStoryBoard"/>

</DataTrigger.EnterActions>

</DataTrigger>

</Style.Triggers>

</Style>

"The previous newly realized generated element was not added to the visual tree by calling either the RecyclingItemsPanel's AddInternalChild or InsertInternalChild method."

Is sounds like because the grid is no longer in focus, the grid is being recycled and the SoldColourBrush that is being animated is causing it to crash, because the Background brush is being replaced with a storyboard.

Any ideas? I turned off the XamDataGrid recycling as you can see, but no effect. I would have thought this should just work.... 

 Hello,

I just reproduced your scenario and got the same exception. I was circling around the background property, but now it makes sense in some way -- the property itself is not initialized or takes incorect value. For example, when you apply some kind of Transform to an element (layout or render) first you have to "initialize" it with some default value in order to be able to actually apply the transformation later,like:

       <Ellipse>
            <Ellipse.RenderTransform>
                <TranslateTransform X="0" Y="0"/>
            </Ellipse.RenderTransform>
        </Ellipse>

and then in the Storyboard for example TargetProperty="(Ellipse.RenderTransform).(TranslateTransform.X)"

I think this is the case here but I am not quite sure. Great job by the way, it looks great.

Thanks,

Alex. 

we are also looking to implement similar functionality - is there a sample project for this post?

What exactly are you trying to implement and which is the part you have difficulties with?

Regards,

Alex. 

The Same Here ... I've Already Done The Animation Part for The Background of a record .. Like This:

<Window.Resources>
        <Storyboard AutoReverse="True" x:Key="storyboard1">
            <ColorAnimation Storyboard.TargetProperty="(Control.Background).(SolidColorBrush.Color)"  From="White" To="Red" Duration="0:0:1" />
        </Storyboard>
        <!--DataRecordCellArea-->
    </Window.Resources>
    <Grid>
        <InfraDP:XamDataGrid Name="dg_test" CellActivated="dg_test_CellActivated" CellChanged="dg_test_CellChanged" CellUpdated="dg_test_CellUpdated" FieldLayoutInitialized="dg_test_FieldLayoutInitialized" FieldPositionChanging="dg_test_FieldPositionChanging"  >
            <InfraDP:XamDataGrid.Resources>
                <Style TargetType="{x:Type InfraDP:CellValuePresenter}">
                    <Setter Property="Background" Value="White" />
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding Mode=TwoWay, RelativeSource={RelativeSource Self}, Path=Record.DataItem.IsChanged}"  Value="True">
                            <DataTrigger.EnterActions>
                                <BeginStoryboard Storyboard="{StaticResource storyboard1}">
                                   
                                </BeginStoryboard>
                            </DataTrigger.EnterActions>
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </InfraDP:XamDataGrid.Resources>

and It Works Fine Since I implemented the INotifyPropertyChanged Interface in my Data class .. Now My Problem Is :

can we set "Record.DataItem.IsChanged" back to false in order to make the trigger activate once more once the "IsChanged" is Set To True ?? Please Help.

Yours:

Gamil.

This is Through XAML ofCourse .. Not Code .. Since I Want To Make Use of The DataTrigger itself in doing such thing ... The Summary of All of This:

Can we set DataItem.IsChanged Property back To True Once The Trigger is Fired .. in XAML .. Many Thanks To You.

Yours:

Gamil.