Microsoft KB Archive/149268

= BUG: Odd Behavior with Modal Dialog/Form in ListView ItemClick =

Article ID: 149268

Article Last Modified on 6/24/2004

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APPLIES TO


 * Microsoft Visual Basic 5.0 Learning Edition
 * Microsoft Visual Basic 6.0 Learning Edition
 * 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
 * Microsoft Visual Basic 4.0 Standard Edition
 * Microsoft Visual Basic 4.0 Professional Edition
 * Microsoft Visual Basic 4.0 32-Bit Enterprise Edition

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This article was previously published under Q149268



SYMPTOMS
Showing a modal form or dialog box (such as a message box) as a result of code in the ItemClick event of a ListView control can cause odd behavior with the ListView when the modal form or dialog box is dismissed. The ListItem that was clicked often moves around the ListView control and appears to be attached to the mouse pointer.



RESOLUTION
This problem is a result of the modal form interrupting the normal flow of execution. To avoid this problem, do not show any modal forms or dialog boxes in code for the ItemClick event. If the ListView needs to be able to respond to an ItemClick and needs information from the item that was clicked on, one should save the ListItem object passed to the ItemClick event and use it in the Click event for the same ListView control. Any processing that needs to be completed when an item is clicked upon can be performed in the Click event with the saved ListItem object. The following code shows this technique by declaring and using private form-level variable of type ListItem. This variable is set in the ItemClick event (which is fired before the Click event) and then is used in the Click event that is fired immediately after the ItemClick. Private itmSaved As ListItem

Private Sub ListView1_ItemClick(ByVal Item As ListItem) Set itmSaved = Item End Sub

Private Sub ListView1_Click MsgBox itmSaved.Text End Sub



STATUS
Microsoft has confirmed this to be an issue in the Microsoft products listed at the beginning of this article.



Steps to Reproduce
 Start Visual Basic 4.0, 32-bit version. Form1 is created by default. Add a single ListView control to the form.  Add this code to Form1: Private Sub Form_Load ListView1.ListItems.Add, "K1", "hello world" End Sub

Private Sub ListView1_ItemClick(ByVal Item As ListItem) MsgBox Item.Text End Sub  Press F5 or select Start from the Run menu to start the application. Click on the single ListItem object and choose OK to dismiss the message box. Observe the fact that the ListItem object now appears attached to the mouse pointer and moves with the mouse pointer all over the ListView control.

Additional query words: kbVBp400bug kbVBp kbdsd kbDSupport kbControl kbVBp500bug kbVBp600bug

Keywords: kbbug kbpending KB149268

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