BUG: Visible Property of Sheridan Command Button May Not Work

Last reviewed: October 9, 1996
Article ID: Q150193

The information in this article applies to:

Standard, Professional, and Enterprise Editions of Microsoft Visual Basic, 16-bit and 32-bit, for Windows, version 4.0

SYMPTOMS

The Sheridan Command button does not stay invisible although the Visible property is set to false. This can occur if the Visible property of a Sheridan Command button was set to false in a procedure in another form.

STATUS

Microsoft has confirmed this to be an issue in the Microsoft products listed at the beginning of this article. Microsoft is researching this issue and will post new information here in the Microsoft Knowledge Base as it becomes available.

WORKAROUND

Use the ShowWindow API function instead of the Visible property of the button to hide/show the button. This function takes only two parameters: a window handle that becomes the hWnd property of the Sheridan control, and a constant that determines how to show the window.

The declaration below can be pasted in the General...Declarations section of the form where the routine is to hide the window:

   #If Win16 Then

   Private Declare Function ShowWindow Lib "User" (ByVal hWnd As Integer,

   ByVal nCmdShow As Integer) As Integer

   #Else

   Private Declare Function ShowWindow Lib "user32" (ByVal hwnd As Long,

   ByVal nCmdShow As Long) As Long

   #EndIf


   Const SW_SHOW = 5

   Const SW_HIDE = 0

To hide a Sheridan Command button, issue a command similar to the following:

   ShowWindow Form1.SSCOmmand1.HWnd, SW_HIDE

and, to show a button:

    ShowWindow Form1.SSCommand1.HWnd, SW_SHOW

MORE INFORMATION

Steps to Reproduce Problem

Start a new project. Form1 is created by default. On Form1 place a regular Command button and a Sheridan SSCommand button. Go to the Properties window and change the TabIndex property of the SSCommand1 control to 0.

In the Form_Load event for Form1, place the following code:

   Private Sub Form_Load()

       Form2.Show

   End Sub

Insert another form into the project. On Form2, place a regular command button. In the Command1_Click event for the button on Form2, place the following code:
```
   Private Sub Command1_Click()

       Form1.SSCommand1.Visible = False

   End Sub
```

Run the project by pressing the F5 key. Bring Form2 to the foreground and press the Command button to make the Sheridan Command button on Form1 disappear. Click anywhere on Form1 to bring it to the foreground. Notice that SSCommand1 reappears.

To correct this problem with the workaround, paste the declaration for ShowWindow in the Form...Declarations section of Form2. Instead of the command to make Visible property false, use the following command:

   Call ShowWindow(Form1.SSCOmmand1.HWnd, SW_HIDE)

The button will not reappear until the following command is issued:

   Call ShowWindow(Form1.SSCommand1.HWnd, SW_SHOW)

Additional reference words: 4.00 vb4win vb4all
KBCategory: kbprg kbbuglist
KBSubcategory: PrgOther

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Last reviewed: October 9, 1996
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