Retrieve a TextBox element dinamically created and Focus it

Posted by user335444 on Stack Overflow See other posts from Stack Overflow or by user335444
Published on 2010-05-07T16:52:25Z Indexed on 2010/05/07 16:58 UTC
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Hi, I have a collection (VariableValueCollection) of custom type VariableValueViewModel objects binded with a ListView. WPF Follow:

<ListView ItemsSource="{Binding VariableValueCollection}" Name="itemList">
    <ListView.Resources>
        <DataTemplate DataType="{x:Type vm:VariableValueViewModel}">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="180"></ColumnDefinition>
                </Grid.ColumnDefinitions>
                <TextBox TabIndex="{Binding Path=Index, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" Grid.Column="0" Name="tbValue" Focusable="True" LostFocus="tbValue_LostFocus" GotFocus="tbValue_GotFocus" KeyDown="tbValue_KeyDown">
                    <TextBox.Text>
                        <Binding Path="Value" UpdateSourceTrigger="PropertyChanged" Mode="TwoWay">
                            <Binding.ValidationRules>
                                <ExceptionValidationRule></ExceptionValidationRule>
                            </Binding.ValidationRules>
                                </Binding>
                     </TextBox.Text>
                </TextBox>                            
             </Grid>
         </DataTemplate>
     </ListView.Resources>
 </ListView>

My Goal is to add a new row when I press "enter" on last row, and Focus the new row. To do that, I check that row is the last row and add a new row in that case. But I don't know how to focus the new TextBox...

Here the KeyPressed method:

private void tbValue_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.Key == System.Windows.Input.Key.Enter)
        {

            DependencyObject obj = itemList.ContainerFromElement((sender as TextBox));                
            int index = itemList.ItemContainerGenerator.IndexFromContainer(obj);
            if( index ==  (VariableValueCollection.Count - 1) )
            {
                // Create a VariableValueViewModel object and add to collection. In binding, that create a new list item with a new TextBox
                ViewModel.AddNewRow();

                // How to set cursor and focus last row created?
            }

        }
    }

Thank's in advance...

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