PRB: THREED Check Box Is Not Grayed Out When Value = 2 in VB

- Professional Edition of Microsoft Visual Basic for Windows,

  versions 2.0 and 3.0

  system for Windows, version 1.0

SYMPTOMS

If the Value property of a THREED Check Box is set to 2, the check box is not made unavailable (grayed out), as you might expect. Instead, an X is displayed in the THREED Check Box. If the Value property of a standard Visual Basic for Windows check box is set to 2, the check box is made unavailable.

CAUSE

There is no disabled state for a THREED check box. The value property of a THREED check box can only be true or false (0 or 1) whereas the standard check box can have a value of 0, 1, or 2.

STATUS

This behavior is by design.

MORE INFORMATION

Steps to Reproduce Behavior

1. Start Visual Basic or from the File menu, choose New Project (ALT, F, N) if Visual Basic is already running. Form1 is created by default.

2. From the File menu, choose Add File. In the Files box, select the THREED.VBX custom control file.

3. Place one THREED Check Box, one standard check box, and three command buttons on Form1.

4. Enter the following code in the appropriate event procedures:

      Sub Form_Load ()
         Command1.Caption = "Value = 0"
         Command2.Caption = "Value = 1"
         Command3.Caption = "Value = 2"
      End Sub
   
      Sub Command1_Click ()
         Check1.Value = 0
         Check3D1.Value = 0
      End Sub
   
      Sub Command2_Click ()
         Check1.Value = 1
         Check3D1.Value = 1
      End Sub
   
      Sub Command3_Click ()
         Check1.Value = 2
         Check3D1.Value = 2
      End Sub
   
   

5. Press F5 to run the program. First, click the Value = 0 button. Then click the Value = 1 button. Finally, click the Value = 2 button. When you click the Value = 2 button, the standard check box is disabled (grayed) but the THREED check box is not.