Doh! That's a big enough difference !

>Only difference I see is that you used a ListBox, and I'm using a ListView.
>
>>Hi,
>>
>>Snip from the solution: "Actually after calling the "SetActivePattern" the control return to the Listview changed event and it retun to ListView. So again the Focus moved to ListView."
>>
>>I don't see this. Here's a simple version:

<Window x:Class="WpfApplication1.Junk"
>>    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
>>    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
>>    Title="Junk" Height="300" Width="300">
>>    <StackPanel>
>>        <Button Height="23" HorizontalAlignment="Left" Margin="50,30,0,0" Name="button1" VerticalAlignment="Top" Width="75">Button</Button>
>>        <TextBox Height="23" Margin="40,66,88,0" Name="txtPatternName" Text="{Binding Path=PatternName, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" VerticalAlignment="Top" />
>>        <StackPanel>
>>            <ListBox Height="65" Margin="59,0,120,45" Name="listBox1" VerticalAlignment="Bottom" SelectionChanged="listBox1_SelectionChanged" >
>>                <ListBoxItem>One</ListBoxItem>
>>                <ListBoxItem>Two</ListBoxItem>
>>                <ListBoxItem>Three</ListBoxItem>
>>            </ListBox>
>>        </StackPanel>
>>    </StackPanel>
>></Window>

with

       private void listBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
>>        {
>>            txtPatternName.Focus();
>>        }

This seems to work fine - why did your code behave differently?
>>Regards,
>>Viv
>>
>>
>>
>>
>>>Well. problem solved...Got a working answer from the WPF forum on http://social.msdn.microsoft.com/Forums/en-US/wpf/threads/
>>>
>>>Here is the reply from that smart person that works perfectly. There may be other solutions, but I can say that this one did indeed work:
>>>
>>>

>>>Hi,
>>>
>>>Actually after calling the "SetActivePattern" the control return to the Listview changed event and it retun to ListView. So again the Focus moved to ListView. To overcome u start the SetActivePattern function in a Dispatcher.Invoke or BeginInvoke with System Idle priority u get the focus in text pattern. See the sample below
>>>
>>>define a delegate
>>>private delegate void focus(HolePattern NewActivePattern);
>>>
>>>paste the below code inside the lvHolePatterns_SelectionChanged
>>>
>>>this.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.SystemIdle, new focus(SetActivePattern),
>>>(HolePattern)lvSender.SelectedItem);
>>>
>>>Hope this helps
>>>Regards
>>>Anandakumar.R
>>>

>>>
>>>
>>>
>>>
>>>
>>>>Hi Matt,
>>>>
>>>>Have you checked the KeyboardNavigation.TabNavigation property? This property controls how navigation is handled in WPF containers.
>>>>
>>>>Focus can fail for any of the following reasons:-
>>>>
>>>>1] Element Enabled = false
>>>>2] Element IsVisible = false
>>>>3] Element Focusable = false
>>>>
>>>>Or
>>>>
>>>>4] Element is in a control and not the main xaml (not been loaded)
>>>>5] LostKeyboardFocus and PreviewLostKeyboardFocus are preventing it
>>>>
>>>>Where you are trying to set the Focus in your code put a new line in that makes a call to the textbox PredictFocus method and set a breakpoint. PredictFocus will not shift the focus but it will tell you what should be focused next and help resolve containers that are not releasing the focus.
>>>>
>>>>HTH
>>>>Neil