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Microsoft KB Archive/175222

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Knowledge Base

Article ID: 175222

Article Last Modified on 7/13/2004


  • Microsoft Visual Basic 6.0 Learning Edition
  • Microsoft Visual Basic 6.0 Professional Edition
  • Microsoft Visual Basic 6.0 Enterprise Edition
  • Microsoft Visual Basic 5.0 Control Creation Edition
  • Microsoft Visual Basic 5.0 Professional Edition
  • Microsoft Visual Basic 5.0 Enterprise Edition

This article was previously published under Q175222


When creating a UserControl in Visual Basic you may have code that you don't what to run when the control is on a Form at design-time, but you do want to run when the Form is in run-time. This article shows how to use the AmbientProperties Object to tell when a host container of a control is in design or run-time.


When a UserControl is placed on a form, any constituent controls that are in the control are in run-time mode, not design-time mode. Usually this does not cause any trouble for the developer. But there are cases where you need to have an event happen only when the container for the UserControl is in run-time. The following example shows how to enable or disable a Timer control by testing to see if the container is in design-time or run-time.

Step-by-Step Example

  1. Create a New Standard EXE project.
  2. From the Project Menu, select Add UserControl.
  3. Add a Timer and a Label control to the UserControl.
  4. Add the Following Code to the UserControl:

          Private Sub Timer1_Timer()
             Label1.Caption = Time()
          End Sub
          Private Sub UserControl_Show()
             If Ambient.UserMode Then 'We are in run-time
                Timer1.Interval = 1000
                Timer1.Enabled = True
             Else 'We are in design-time
                Timer1.Enabled = False
                Label1.Caption = "design time"
             End If
          End Sub
  5. Close the UserControl.
  6. Add the UserControl to Form1.
  7. Run the Form.
  8. Close the Form.


Visual Basic Component Tools Guide, Chapter 9.

Additional query words: ActiveX Control kbVBp500 kbVBp600 kbVBp kbdsd kbDSupport KBCONTROL KBCTRLCREATE

Keywords: kbhowto kbgrpdsvb KB175222