XL2000: Problems Using TripleState Property for Option Button

If you view the properties list for an ActiveX OptionButton control, you will be able to set the TripleState property to either True or False. However, setting it to either True or False has no effect on the control's behavior.

The TripleState property is available for the OptionButton control, but it is essentially disabled for the control. Regardless of the setting of the TripleState property, through the user interface, you cannot set the OptionButton to a value other than True (selected) or False (not selected).

The TripleState property is designed to work with the ActiveX CheckBox control. If you set the TripleState property of an ActiveX CheckBox control to True, then you can toggle the value of the CheckBox from True (selected), to False (cleared) to Null (dimmed).

If you set the TripleState property of an OptionButton to True, you can programmatically set the value of the OptionButton to Null. This will give you the same effect as setting the CheckBox control to Null (the OptionButton appears dimmed).

Microsoft provides programming examples for illustration only, without warranty either expressed or implied, including, but not limited to, the implied warranties of merchantability and/or fitness for a particular purpose. This article assumes that you are familiar with the programming language being demonstrated and the tools used to create and debug procedures. Microsoft support professionals can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific needs.
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For more information about the support options that are available and about how to contact Microsoft, visit the following Microsoft Web site:http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS (http://support.microsoft.com/default.aspx?scid=fh;en-us;cntactms) The following example macro demonstrates setting an OptionButton to Null.

Setting Up the Control

1. Close and save any open workbooks, and then open a new workbook.
2. If the Control Toolbox toolbar is not visible, point to Toolbars on the View menu, and then click Control Toolbox.
3. Click the OptionButton control on the Control Toolbox toolbar, and then draw an OptionButton on Sheet1.
4. Click the Exit Design Mode button on the Control Toolbox toolbar.

Sample Macro Code

1. On the Tools menu, point to Macro, and then click Visual Basic Editor.
2. On the Insert menu click Module.
3. Enter the following code in the module.

   Sub Set_Option()
   
   Dim Choice As Integer
   Dim MyPrompt As String
   
   MyPrompt =  "Type 1 for Selected, 2 for Not Selected and 3 for Grayed"
   Choice = InputBox(MyPrompt)
   
   Select Case Choice
   
      Case 1
         Sheet1.OptionButton1.Value = True
   
      Case 2
         Sheet1.OptionButton1.Value = False
   
      Case 3
         Sheet1.OptionButton1.Value = Null
   
      End Select
   
   End Sub
   						

Running the Macro

1. Return to Microsoft Excel (press ALT+F11).
2. Select any cell in Sheet1.
3. On the Tools menu, point to Macro, and then click Macros.
4. Select Set_Option and click Run.
5. Enter either 1, 2, or 3 in the InputBox when prompted, and click OK.

The OptionButton will be set to the state that matches the number you entered in the InputBox (1 = ON, 2 = OFF, 3 = Grayed).

For more information about option button controls, click Microsoft Excel Help on the Help menu, type option buttons in the Office Assistant or the Answer Wizard, and then click Search to view the topic.
  Finally, click the Add option buttons to a worksheet topic.