How to toggle visible attribute in DDT control?

Thank you for your help. That was an excellent teaching example. I learned more than I had hoped.


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[Semen Matusovski]

A lot of variants. For example,

   #Compile Exe
   #Register None
   #Dim All
   #Include "Win32Api.Inc"

   CallBack Function DlgProc
      
      Select Case CbMsg
         Case %WM_INITDIALOG
            Control Add Button, CbHndl, 101, "Hide/Show Button 2", 5, 10, 75, 15
            Control Add Button, CbHndl, 102, "Button 2", 100, 10, 75, 15
         Case %WM_COMMAND
            If CbCtl = 101 Then ' Hide/Show
               Local hWnd As Long, newState As Long
               hWnd = GetDlgItem(CbHndl, 102) ' Button 2
               If IsWindowVisible(hWnd) Then newState = %SW_HIDE Else newState = %SW_SHOW
               ShowWindow hWnd, newState
            End If
      End Select
   End Function

   Function PbMain
      Local hDlg As Long
      Dialog New 0, "Toggle",,, 180, 40, %WS_SYSMENU Or %WS_CAPTION To hDlg
      Dialog Show Modal hDlg Call DlgProc
   End Function

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I am starting my first DDT application. I am building
a "work day" calendar in PB that is intended
to display a calendar with Sundays, Saturdays, and
work holidays (read from a btrieve database) grayed.
I am having difficulty changing the attributes of my buttons.
I can mark a hidden button visible, but rehiding a button is
apparently impossible, and I am not able to mark buttons
as disabled after they are created. I have even tried
storing location and size and killing and adding a control,
and the changes are not displayed. What would be the
proper technique for changing attributes of existing controls?



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