How to set focus on NumericUpDown control?

I am trying to set focus on NumericUpDown element from WPFs extended toolkit.

I heve following XAML

<Window ... 
    xmlns:extToolkit="http://schemas.microsoft.com/winfx/2006/xaml/presentation/toolkit/extended"
<Grid>
    <StackPanel HorizontalAlignment="Center" VerticalAl开发者_StackOverflow中文版ignment="Center" Orientation="Horizontal" FocusManager.IsFocusScope="True">
        <extToolkit:NumericUpDown HorizontalAlignment="Left" VerticalAlignment="Top" x:Name="ItemsCount" Value="1"/>
        <TextBlock Text="XXX" Margin='10,0,0,0'/>
    </StackPanel>        
</Grid>
</Window>

I called Keyboard.Focus(ItemsCount) and ItemsCount.Focus() from constructor and from Loaded event with no success.

Control is getting focus when I press Tab, but in my case it is not acceptable.

I didn't found enything on google as well.

Is there any way to focus NumericUpDown?

P.S.

Calling Focus() works for TextBox so it's must be control specific issue.

Maybe it is not set to be focusable, have you checked the value of Focusable?

Set the SelectAllOnGotFocus property to True

NumericUpDown1.Select(0, 1)    

'Set Tabstop to 1 'Initialize NumericUpDown1 with a single numeric value (i.e. "1").