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Microsoft KB Archive/168824

From BetaArchive Wiki

Article ID: 168824

Article Last Modified on 8/7/2007



APPLIES TO

  • Microsoft Visual Basic 5.0 Professional Edition
  • Microsoft Visual Basic 6.0 Professional Edition
  • Microsoft Visual Basic 5.0 Enterprise Edition
  • Microsoft Visual Basic 6.0 Enterprise Edition



This article was previously published under Q168824

SYMPTOMS

When setting the ComboBox control Text property in the Click event of ComboBox control, the text always returns blank. This is different behavior than Visual Basic 3.0 and Visual Basic 4.0.

RESOLUTION

Instead of setting the Text property of the ComboBox control in the Click event, change it at the LostFocus event by shifting the focus to another control, such as TextBox, although it leaves the focus set to the TextBox. To work around that, hide a TextBox behind the ComboBox with TabStop property set to False. In the GotFocus event of the TextBox, set the focus back to the ComboBox. To place a TextBox behind the ComboBox in design time, choose the Send To Back menu command from the Format/Order menu. In run time, set the z-order of TextBox to 1.

The following code example shows how to keep the text of ComboBox control after being set at the Click event:

  1. Start a new Standard EXE project. Form1 is created by default.
  2. Add a TextBox control, Text1, to Form1.
  3. Add a ComboBox control, Combo1, to Form1.
  4. Place the following code into the General Declarations section of Form1:

          Dim ClickFlag As Integer
    
          Private Sub Combo1_Click()
             ClickFlag = True
             Text1.SetFocus
          End Sub
    
          Private Sub Combo1_LostFocus()
             If ClickFlag = True Then
                Combo1.Text = Mid(Combo1.Text, 4)
                ClickFlag = False
             End If
          End Sub
    
          Private Sub Form_Load()
             ClickFlag = False
             With Combo1
                 .AddItem "1. Adam"
                 .AddItem "2. Bob"
                 .AddItem "3. Charles"
             End With
             Combo1.Text = Mid(Combo1.List(0), 4)
    
             'Hide Text1 under Combo1
             Text1.Move Combo1.Left, Combo1.Top, Combo1.Width, Combo1.Height
             Text1.ZOrder (1)
             Text1.TabStop = False
          End Sub
    
          Private Sub Text1_GotFocus()
             Combo1.SetFocus
          End Sub
                        


STATUS

Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article. This bug was corrected in the latest service pack for Visual Studio 6.0.

For additional information about Visual Studio service packs, click the following article numbers to view the articles in the Microsoft Knowledge Base:

194022 INFO: Visual Studio 6.0 Service Packs, What, Where, Why

194295 HOWTO: Tell That a Visual Studio Service Pack Is Installed


To download the latest Visual Studio service pack, visit the following Microsoft Web site:

MORE INFORMATION

Steps to Reproduce Behavior

  1. Start a new Standard EXE project. Form1 is created by default.
  2. Add a ComboBox control, Combo1, to Form1.
  3. Paste the following code into the General Declarations section of Form1:

          Private Sub Combo1_Click()
             Combo1.Text = Mid(Combo1.Text, 1, 3)
          End Sub
    
          Private Sub Form_Load()
            With Combo1
              .AddItem "1. Adam"
              .AddItem "2. Bob"
              .AddItem "3. Charles"
            End With
            Combo1.Text = Mid(Combo1.List(0), 4)
          End Sub
    
                        
  4. Start the program or press the F5 key.
  5. Click one item of the ComboBox control drop-down list and note that the text portion of the ComboBox control is wiped out and becomes blank.

(c) Microsoft Corporation 2000, All Rights Reserved. Contributions by Adrian Chiang, Microsoft Corporation

Keywords: kbbug kbctrl kbfix kbvs600sp4fix kbvs600sp5fix KB168824