BUG: UserControl Event Is Not Raised from a Modal Form (177996)



The information in this article applies to:

  • Microsoft Visual Basic Learning Edition for Windows 5.0
  • Microsoft Visual Basic Learning Edition for Windows 6.0
  • Microsoft Visual Basic Professional Edition for Windows 5.0
  • Microsoft Visual Basic Professional Edition for Windows 6.0
  • Microsoft Visual Basic Enterprise Edition for Windows 5.0
  • Microsoft Visual Basic Enterprise Edition for Windows 6.0

This article was previously published under Q177996

SYMPTOMS

If an event is raised from a UserControl while a modal form is active, the event is not executed.

CAUSE

The event is not executed if the UserControl is compiled into an OCX and referenced from a project that is run in the IDE.

RESOLUTION

There are two workarounds to this problem:
  1. Use the compiled ActiveX component (OCX) only with compiled client programs (EXE). In other words, both Visual Basic projects are compiled.

    -or-
  2. Use both the ActiveX component and the client project in the IDE in a project group. In other words, both Visual Basic projects are in design mode.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.

MORE INFORMATION

The following section shows you how to create a sample project that demonstrates this problem. To reproduce this behavior, you first need to create a compiled ActiveX control with a custom event. Then you make a reference to this control from another project and run that project in the IDE.

Create the ActiveX Control

  1. Start a new ActiveX control project in Visual Basic. UserControl1 is created by default.
  2. Add a new form to the project. Add a CommandButton to Form1.
  3. Copy the following code to the Code window of UserControl1:
          Option Explicit
          Private WithEvents MyCommand As CommandButton
          Event TestEvent()
    
          Private Sub MyCommand_Click()
             RaiseEvent TestEvent
          End Sub
    
          Private Sub UserControl_Click()
             Set MyCommand = Form1.Command1
             Form1.Caption = "UserControl Form"
             Form1.Show vbModal
          End Sub
    
  4. Compile UserControl1 into an OCX file. Close all open windows associated with UserControl1.

Create the Sample Project

  1. Start a new Standard EXE project in Visual Basic. Form1 is created by default.
  2. Make a reference to the ActiveX control you created in the previous section by completing the following steps:

    1. From the Project menu, click Components. The Components dialog box is displayed.
    2. Click Browse to open a dialog box that allows you to select the ActiveX component created in the previous section.
    3. Click OK to close the dialog boxes.
  3. Add the ActiveX control to the Form1 form. Adjust the ActiveX control size to take up most of the form.
  4. Copy the following code to the Code window of Form1:
          Option Explicit
    
          Private Sub UserControl11_TestEvent()
             MsgBox "In the User control test event"
          End Sub
    
  5. Press the F5 key to run the project and click on Form1. The UserControl Form appears. Click Command1 and note that the message box indicating the custom event has executed does not appear.
  6. Make the project into an EXE and run the EXE. Click Form1. The UserControl Form appears. Click Command1 and note that the message box indicating the custom event has executed does appear.

REFERENCES

For additional information, click the article number below to view the article in the Microsoft Knowledge Base:

237286 BUG: Event Does Not Fire in the IDE When Raised from Inside a Compiled Modal Form


Modification Type:MinorLast Reviewed:3/10/2005
Keywords:kbBug kbControl kbCtrlCreate kbpending KB177996