Hi,

I am trying to fire an event KeyDown using trigger for a textbox bound in a template column for a XamWebGrid. Here is the code that I used. We have been using MVVM to bind the data to the view. However, the event KeyDown is not firing only for textbox. The event Click is working perfectly for a button bound in a similar way. Kindly let me know if I am doing anything wrong.

<controls:ChildWindow.Resources>
<!--<Resource:ResourceService x:Key="resources"/>-->
<B:DataContextProxy x:Key="DataContextProxy"/>
</controls:ChildWindow.Resources>

<controls:ChildWindow.Title>
<TextBlock />
</controls:ChildWindow.Title>
<!--<controlsToolkit:BusyIndicator x:Name="BusyIndicator" IsBusy="{Binding IsBusy}" BusyContent="{Binding BusyMessage}">-->
<Grid x:Name="LayoutRoot" Background="White">
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="auto" />
</Grid.RowDefinitions>
<igGrid:XamWebGrid x:Name="igGrid" Grid.Row="0" AutoGenerateColumns="False" CellStyle="{StaticResource CellControlStyle}" RowHover="Row" ItemsSource="{Binding LucaAttributes}" B:XamWebSelectionChanged.Command="{Binding GridRowSelected}">
<igGrid:XamWebGrid.SelectionSettings>
<igGrid:SelectionSettings RowSelection="Single" CellSelection="None" CellClickAction="SelectRow" />
</igGrid:XamWebGrid.SelectionSettings>
<igGrid:XamWebGrid.Columns>
<igGrid:TextColumn Key="Name" TextWrapping="Wrap" Width="auto">
<igGrid:TextColumn.HeaderTemplate>
<DataTemplate>
<TextBlock Text="Attribute Name" />
</DataTemplate>
</igGrid:TextColumn.HeaderTemplate>
</igGrid:TextColumn>
<igGrid:TextColumn Key="Description" TextWrapping="Wrap" Width="auto">
<igGrid:TextColumn.HeaderTemplate>
<DataTemplate>
<TextBlock Text="Description" />
</DataTemplate>
</igGrid:TextColumn.HeaderTemplate>
</igGrid:TextColumn>
<igGrid:TemplateColumn Key="CompanyOverrideValue" Width="*" IsSortable="False" Visibility="{Binding Source={StaticResource DataContextProxy},Path=DataSource.IsCompanyMode, Mode=OneWay, Converter={StaticResource boolToVisibilityConverter}}">
<igGrid:TemplateColumn.HeaderTemplate>
<DataTemplate>
<TextBlock Text="Override Value" />
</DataTemplate>
</igGrid:TemplateColumn.HeaderTemplate>
<igGrid:TemplateColumn.ItemTemplate>
<DataTemplate>
<TextBox IsEnabled="True"
Text="{Binding Path=CompanyOverrideValue, Mode=TwoWay}"
Width="100">
<B:BehaviorService.Behavior>
<B:TextBoxFastBindBehavior/>
</B:BehaviorService.Behavior>
<i:Interaction.Triggers>
<i:EventTrigger EventName="KeyDown">
<Commands:EventToCommand Command="{Binding Path=KeyDown, Mode=TwoWay}" CommandParameter="{Binding}" PassEventArgs="False" />
</i:EventTrigger>
</i:Interaction.Triggers>
</TextBox>
</DataTemplate>
</igGrid:TemplateColumn.ItemTemplate>
</igGrid:TemplateColumn>
<igGrid:TemplateColumn Key="UserOverrideValue" Width="*" IsSortable="False" Visibility="{Binding Source={StaticResource DataContextProxy},Path=DataSource.IsUserMode, Mode=OneWay, Converter={StaticResource boolToVisibilityConverter}}">
<igGrid:TemplateColumn.HeaderTemplate>
<DataTemplate>
<TextBlock Text="Override Value" />
</DataTemplate>
</igGrid:TemplateColumn.HeaderTemplate>
<igGrid:TemplateColumn.ItemTemplate>
<DataTemplate>
<TextBox IsEnabled="True"
Style="{StaticResource Copyable}"
Text="{Binding Path=UserOverrideValue, Mode=TwoWay}"
Width="100">
<B:BehaviorService.Behavior>
<B:TextBoxFastBindBehavior/>
</B:BehaviorService.Behavior>
<i:Interaction.Triggers>
<i:EventTrigger EventName="KeyDown">
<Commands:EventToCommand Command="{Binding Source={StaticResource DataContextProxy},Path=DataSource.KeyDown, Mode=TwoWay}" CommandParameter="{Binding}" PassEventArgs="False" />
</i:EventTrigger>
</i:Interaction.Triggers>
</TextBox>
</DataTemplate>
</igGrid:TemplateColumn.ItemTemplate>
</igGrid:TemplateColumn>
<igGrid:TextColumn Key="DefaultValue" TextWrapping="Wrap" Width="auto">
<igGrid:TextColumn.HeaderTemplate>
<DataTemplate>
<TextBlock Text="Default Value" />
</DataTemplate>
</igGrid:TextColumn.HeaderTemplate>
</igGrid:TextColumn>
<igGrid:TemplateColumn Key="AttributeId" Visibility="Visible">
<igGrid:TemplateColumn.HeaderTemplate>
<DataTemplate>
<TextBlock Text="" />
</DataTemplate>
</igGrid:TemplateColumn.HeaderTemplate>
<igGrid:TemplateColumn.ItemTemplate>
<DataTemplate>
<StackPanel>
<Button IsEnabled="True" Content="{Binding Resource.ControlText_Save, Source={StaticResource resources}}">
<!--<HyperlinkButton IsEnabled="True" Content="{Binding Resource.ControlText_Save, Source={StaticResource resources}}">-->
<i:Interaction.Triggers>
<i:EventTrigger EventName="Click">
<Commands:EventToCommand Command="{Binding Source={StaticResource DataContextProxy},Path=DataSource.SaveAttribute}" CommandParameter="{Binding}" PassEventArgs="False" />
</i:EventTrigger>
</i:Interaction.Triggers>
<!--</HyperlinkButton>-->
</Button>
</StackPanel>
</DataTemplate>
</igGrid:TemplateColumn.ItemTemplate>
</igGrid:TemplateColumn>
</igGrid:XamWebGrid.Columns>
</igGrid:XamWebGrid>
</Grid>

My ViewModel code:

public class EditAttributesViewModel: INotifyPropertyChanged
{
#region Private Fields

private Guid _productID;
private Guid _userID;

private readonly ILucaAttributeClientService _lucaAttributeClientService;

private IList<LucaAttribute> _allAttributes;

private LucaAttribute _selectedRow;

private bool _iscompanymode = false;
private bool _isusermode = false;
private string _str = "Shutup";
#endregion

#region Public Properties

public DelegateCommand<object> GridRowSelected { get; set; }
public IList<LucaAttribute> LucaAttributes { get; set; }
public DelegateCommand<LucaAttribute> SaveAttribute { get; set; }
public DelegateCommand<KeyEventArgs> KeyDown;

public Guid ProductID
{
get { return _productID; }
set
{
_productID = value;
GetAttributesList(_productID);
}
}

public Guid UserID
{
get { return _userID; }
set { _userID = value; }
}

public LucaAttribute SelectedRow
{
get { return _selectedRow; }
set
{
_selectedRow = value;
OnPropertyChanged("SelectedRow");
}
}

public bool IsCompanyMode
{
get { return _iscompanymode; }
set { _iscompanymode = value; OnPropertyChanged("IsCompanyMode"); }
}

public bool IsUserMode
{
get { return _isusermode; }
set { _isusermode = value; OnPropertyChanged("IsUserMode"); }
}

#endregion

#region Constructor
public EditAttributesViewModel(ILucaAttributeClientService lucaAttributeClientService)
{
_allAttributes = new List<LucaAttribute>();
LucaAttributes = new List<LucaAttribute>();
_lucaAttributeClientService = lucaAttributeClientService;
_lucaAttributeClientService.GetAttributesByProductAsyncCompleted += GetAttributesByProductCompleted;
GridRowSelected = new DelegateCommand<object>(OnGridRowSelected);
SaveAttribute = new DelegateCommand<LucaAttribute>(OnSaveAttribute,CanSaveAttribute);
KeyDown = new DelegateCommand<KeyEventArgs>(OnKeyDown);

}
#endregion

#region Public methods

private void OnKeyDown(KeyEventArgs e)
{
if (SelectedRow.ValidateValueforDouble(SelectedRow.CompanyOverrideValue))
{
throw new ArgumentException(Resource.ValidationMessage_ValidInteger);
}
else if (SelectedRow.ValidateValueforDate(SelectedRow.CompanyOverrideValue))
{
throw new ArgumentException(Resource.ValidationMessage_ValidDate);
}
}

public bool CanSaveAttribute(LucaAttribute item)
{
return true;
}

public void OnSaveAttribute(LucaAttribute item)
{
if (SelectedRow != null && IsCompanyMode)
{
string text = SelectedRow.CompanyOverrideValue;
}
}

public void GetAttributesList(Guid productID)
{
_lucaAttributeClientService.GetAttributesByProductAsync(productID);
}

void GetAttributesByProductCompleted(object sender, EventArgs<List<LucaAttribute>> e)
{
if (_allAttributes != null)
{
_allAttributes.Clear();
LucaAttributes.Clear();
e.Value.ForEach(_allAttributes.Add);
foreach (LucaAttribute item in _allAttributes)
{
LucaAttributes.Add(item);
}
}
}

private void OnGridRowSelected(object obj)
{
SelectedRow = obj as LucaAttribute;

if (SelectedRow != null)
{
OnPropertyChanged("SelectedRow");
}
}

public void OnPropertyChanged(string name)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(name));
}

#endregion

#region INotifyPropertyChanged Members

public event PropertyChangedEventHandler PropertyChanged;

#endregion
}

Thanks,

Abhiram.