FIX: The LostFocus event is raised before the GotFocus event when you press the TAB key to change the focus to a ComboBox control in the .NET Framework 1.0 (813031)

MORE INFORMATION

Steps to reproduce the behavior

1. Start Microsoft Visual Studio .NET.
2. On the File menu, point to New, and then click Project. The New Project dialog box appears.
3. Under Project Types, click Visual Basic Projects.
4. Under Templates, click Windows Application.
5. In the Name box, type MyApp, and then click OK. By default, one of the following files is created:
   • If you are using Microsoft Visual Basic .NET, a file that is named Form1.vb is created.
   • If you are using Microsoft Visual C# .NET, a file that is named Form1.cs is created.
6. Add a TextBox control and a ComboBox control to the Form1 form.
7. Right-click the ComboBox control, and then click Properties.
8. In the Properties window, set the DropDownStyle property to Simple or to DropDown.
9. In Solution Explorer, use one of the following procedures:
   • If you are using Visual Basic .NET, right-click Form1.vb, and then click View Code.
   • If you are using Visual C# .NET, right-click Form1.cs, and then click View Code.
10. Use one of the following procedures, depending on the programming language that you are using:
    • If you are using Visual Basic .NET, follow these steps:
      1. Locate the following code in the Form1.vb file.

         End Class

      2. Add the following code before the code that you located in step a.

         Private Sub ComboBox1_GotFocus(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.GotFocus
             System.Diagnostics.Debug.WriteLine("ComboBox1 GotFocus")
         End Sub
         Private Sub ComboBox1_LostFocus(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.LostFocus
             System.Diagnostics.Debug.WriteLine("ComboBox1 LostFocus")
         End Sub

    • If you are using Visual C# .NET, follow these steps:
      1. Locate the following code in the Form1.cs file.

         this.comboBox1.Name = "comboBox1";

      2. Add the following code after the code that you located in step a.

         this.comboBox1.GotFocus += new System.EventHandler(this.comboBox1_GotFocus);
         this.comboBox1.LostFocus += new System.EventHandler(this.comboBox1_LostFocus);

      3. Add the following code after the Main procedure.

         private void comboBox1_GotFocus(object sender, System.EventArgs e)
         {
             System.Diagnostics.Debug.WriteLine("comboBox1_GotFocus");
         }
         private void comboBox1_LostFocus(object sender, System.EventArgs e)
         {
             System.Diagnostics.Debug.WriteLine("comboBox1_LostFocus");
         }

11. On the Build menu, click Build Solution.
12. On the Debug menu, click Start. Press TAB.