Visual Basic Reference

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Parent Property Example

This example passes a control from a form that doesn't have the focus to a procedure in a module, and then displays the state of the control on the parent form. To try this example, create three forms: Form1, containing a CommandButton control, and Form2 and Form3, each containing a CheckBox control. You must also create a new module (click Add Module in the Project menu). Paste the code into the Declarations sections of the respective forms or module, and then press F5 to run the program.

  ' Enter this code into Form1.
Private Sub Form_Load ()
   Form2.Show   ' Display all forms.
   Form3.Show
   Form2.AutoRedraw = True
   Form3.AutoRedraw = True
End Sub

Private Sub Command1_Click ()
   ReadCheckBox Form2.Check1   ' Call procedure in other module
   ReadCheckBox Form3.Check1   ' and send control as argument.
End Sub

' Enter this code into Module1.
Sub ReadCheckBox (Source As Control)
   If Source.Value Then
      Source.Parent.Cls   ' Clear parent form.
      Source.Parent.Print "CheckBox is ON."  ' Display on parent form.
   Else
      Source.Parent.Cls   ' Clear parent form.
      Source.Parent.Print "CheckBox is OFF."  ' Display on parent form.
   End If
End Sub