Next control Focus is incorrectly set when we pop-up a dialog during Validating Event of the

We have encountered a weird problem when we pop-up a dialog during Validating event of the control that we are leaving.

  It looks like there is some problem in WinForms ContainerControl setting focus during Validating event if we have any message pop-up.  We have set up a sample app to illustrate the problem as shown in the code block.  A simple winform app containing one textbox (mainTextBox) and one user control which composes of 2 textboxes showing side by side.  The mainTextBox validating event will show a message box.  If I enter a value in mainTextBox and then click to the 2nd textbox on the UserControl, this will cause the mainTextBox_Validating event handler to be executed and a pop-up message is displayed.  After that, the flashing cursor is displayed on the 2nd textbox component I clicked to in the UserControl but input focus is magically set to the 1st textbox of the UserControl.  So, when I type, letters start appearing in the 1st textbox component instead of the 2nd textbox component of the UserControl!  Now, the flashing cursor and the input focus is out-of-sync.

Is there any way to fix this?

public class Form1 : Form
{
public Form1()
{
     InitializeComponent();
     mainTextBox1.Validating += new CancelEventHandler(mainTextBox1_Validating);            
}       
void mainTextBox1_Validating(object sender, CancelEventArgs e)
{                        
    MessageBox.Show("hi");
}
private void InitializeComponent()
        {
            this.mainTextBox1 = new System.Windows.Forms.TextBox();
            this.mainTextBox2 = new System.Windows.Forms.TextBox();
            this.userControl11 = new test.TestUserControl();
            this.label1 = new System.Windows.Forms.Label();
            this.label2 = new System.Windows.Forms.Label();
            this.label3 = new System.Windows.Forms.Label();
            this.SuspendLayout();
            // 
            // mainTextBox1
            // 
            this.mainTextBox1.Location = new System.Drawing.Point(138, 29);
            this.mainTextBox1.Name = "mainTextBox1";
            this.mainTextBox1.Size = new System.Drawing.Size(100, 20);
            this.mainTextBox1.TabIndex = 0;
            // 
            // mainTextBox2
            // 
            this.mainTextBox2.Location = new System.Drawing.Point(138, 184);
            this.mainTextBox2.Name = "mainTextBox2";
            this.mainTextBox2.Size = new System.Drawing.Size(206, 20);
            this.mainTextBox2.TabIndex = 2;
            // 
            // userControl11
            // 
            this.userControl11.Location = new System.Drawing.Point(138, 96);
            this.userControl11.Name = "userControl11";
            this.userControl11.Size = new System.Drawing.Size(217, 47);
            this.userControl11.TabIndex = 1;
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(47, 32);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(74, 13);
            this.label1.TabIndex = 3;
            this.label1.Text = "mainTextBox1";
            // 
            // label2
            // 
            this.label2.AutoSize = true;
            this.label2.Location = new System.Drawing.Point(47, 106);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(68, 13);
            this.label2.TabIndex = 4;
            this.label2.Text = "UserControl1";
            // 
            // label3
            // 
            this.label3.AutoSize = true;
            this.label3.Location = new System.Drawing.Point(47, 187);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(82, 13);
            this.label3.TabIndex = 5;
            this.label3.Text = "anotherTextBox";
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.AutoValidate = System.Windows.Forms.AutoValidate.EnablePreventFocusChange;
            this.ClientSize = new System.Drawing.Size(634, 282);
            this.Controls.Add(this.label3);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.mainTextBox2);
            this.Controls.Add(this.mainTextBox1);
            this.Controls.Add(this.userControl11);
            this.Name = "Form1";
            this.Text = "Form1";
            this.ResumeLayout(false);
            this.PerformLayout();
        }
}
partial class TestUserControl  : UserControl
{
       /// <summary> 
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;
        /// <summary> 
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }
        #region Component Designer generated code
        /// <summary> 
        /// Required method for Designer support - do not modify 
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.textBox2 = new System.Windows.Forms.TextBox();
            this.SuspendLayout();
            // 
            // textBox1
            // 
            this.textBox1.Location = new System.Drawing.Point(3, 3);
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(100, 20);
            this.textBox1.TabIndex = 0;
            // 
            // textBox2
            // 
            this.textBox2.Location = new System.Drawing.Point(109, 3);
            this.textBox2.Name = "textBox2";
            this.textBox2.Size = new System.Drawing.Size(100, 20);
            this.textBox2.TabIndex = 1;
            // 
            // UserControl1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.Controls.Add(this.textBox2);
            this.Controls.Add(this.textBox1);
            this.Name = "UserControl1";
            this.Size = new System.Drawing.Size(217, 47);
            this.ResumeLayout(false);
            this.PerformLayout();
        }
        #endregion
        private System.Windows.Forms.TextBox textBox1;
        private System.Windows.Forms.TextBox textBox2;
}