My name is Edward Tanguay. I'm an American software and web developer living and working in Berlin, Germany.
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WPF CODE EXAMPLE created on Sunday, February 14, 2010 permalink
Two ways to set focus in a programmatically created textbox
This example shows you two ways to set focus for a programmatically created TextBox. If you need to set focus WHILE you are adding the TextBoxes for some reason, use the hack (thanks to Adam Nelson), otherwise, if you can, wait till AFTER you have set the ContentControl and then set focus via the parent of the TextBoxes.
XAML:
<Window x:Class="TestFocksdfj.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300">
    <StackPanel HorizontalAlignment="Left" Margin="10">
        <ContentControl x:Name="FormArea"/>
    </StackPanel>
</Window>

Code Behind:
using System.Windows;
using System.Windows.Controls;
using System.Threading;
using System;
using System.Windows.Input;

namespace TestFocksdfj
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();

            StackPanel sp = new StackPanel();

            for (int i = 0; i < 3; i++)
            {
                TextBox tb = new TextBox();
                tb.Width = 200;
                tb.Margin = new Thickness { Bottom = 3 };
                if (i == 2)
                {
                    //FocusHelper.Focus(tb); //SOLUTION 1 with hack
                }
                sp.Children.Add(tb);
            }

            FormArea.Content = sp;

            //SOLUTION 2 without hack:
            sp.Children[1].Focus();
        }
    }

    //hack:
    static class FocusHelper
    {
        private delegate void MethodInvoker();

        public static void Focus(UIElement element)
        {
            ThreadPool.QueueUserWorkItem(delegate(Object foo)
            {
                UIElement elem = (UIElement)foo;
                elem.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Normal,
                    (MethodInvoker)delegate()
                    {
                        elem.Focus();
                        Keyboard.Focus(elem);
                    });
            }, element);
        }
    }

}

need markup?
 

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