A Bug? ShowDialog and Opacity and TaskBar

I Think I have found a bug. Here is the situation:

In form1 add a button and add this code:

VB Code:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
     Dim frm As New Form2(Me)
     frm.ShowDialog()
     Me.Show()
End Sub

In Form2 add this code:

VB Code:

Public Class Form2
    Inherits System.Windows.Forms.Form
    Dim pform As Form
#Region " Windows Form Designer generated code "
 
    Public Sub New(ByVal frm As Form)
        MyBase.New()
        pform = frm
        'This call is required by the Windows Form Designer.
        InitializeComponent()
 
        'Add any initialization after the InitializeComponent() call
 
   End Sub
' 
'
'
Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Me.Opacity = 0.99 ' Any value less than 1 
        Me.Opacity = 1 ' Even if you dont change it to 1 it still happens
     '   MessageBox.Show(Me.ShowInTaskbar)
        pform.Hide()
     '   MessageBox.Show(Me.ShowInTaskbar)
End Sub

You will note that when Form2 is shown its taksbar icon is hidden, despite ShowInTaskbar property of Form2 remains True. This situation happens if only
1-you change the Opacity
2- hide the parent form
3-form be shown modally.

This is tested only in VB.NET and Framework 1.1

If its a bug, how can I report it to MS? any MVP around?

Attached is the project if you want to test.

No idea?

Put this line pform = frm after InitializeComponent() and see if it works.

Quote:

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Originally posted by DevGrp
Put this line pform = frm after InitializeComponent() and see if it works.

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No it does not work!

In fact i just noticed if you change the opacity in the load event of the startup form you wont get its icon in taks bar.

erm when using opacity , 1 represents 100% to make say a 10% ( almost invisible ) you need to do 0.1 , eg:
in Form1 ( no need to modify the New sub in form2 either )

VB Code:

[COLOR=BLUE]Private[/COLOR] [COLOR=BLUE]Sub[/COLOR] Button1_Click([COLOR=BLUE]ByVal[/COLOR] sender [COLOR=BLUE]As[/COLOR] System.Object, [COLOR=BLUE]ByVal[/COLOR] e [COLOR=BLUE]As[/COLOR] System.EventArgs) [COLOR=BLUE]Handles[/COLOR] Button1.Click
        [COLOR=BLUE]Dim[/COLOR] frm [COLOR=BLUE]As[/COLOR] [COLOR=BLUE]New[/COLOR] Form2()
        AddOwnedForm(frm) [COLOR=GREEN]'/// add it as an owned form
[/COLOR]        frm.Show()
    [COLOR=BLUE]End[/COLOR] [COLOR=BLUE]Sub[/COLOR]

in Form2 :

VB Code:

[COLOR=BLUE]Private[/COLOR] [COLOR=BLUE]Sub[/COLOR] Form2_Load([COLOR=BLUE]ByVal[/COLOR] sender [COLOR=BLUE]As[/COLOR] System.Object, [COLOR=BLUE]ByVal[/COLOR] e [COLOR=BLUE]As[/COLOR] System.EventArgs) [COLOR=BLUE]Handles[/COLOR] [COLOR=BLUE]MyBase[/COLOR].Load
        [COLOR=BLUE]Dim[/COLOR] frmMain [COLOR=BLUE]As[/COLOR] Form1 = Owner
        [COLOR=BLUE]Me[/COLOR].Opacity = 0.1 '///0.1 = 10%
        frmMain.Hide()
    [COLOR=BLUE]End[/COLOR] [COLOR=BLUE]Sub
 
[/COLOR]    [COLOR=BLUE]Private[/COLOR] [COLOR=BLUE]Sub[/COLOR] Form2_Closing([COLOR=BLUE]ByVal[/COLOR] sender [COLOR=BLUE]As[/COLOR] [COLOR=BLUE]Object[/COLOR], [COLOR=BLUE]ByVal[/COLOR] e [COLOR=BLUE]As[/COLOR] System.ComponentModel.CancelEventArgs) [COLOR=BLUE]Handles[/COLOR] [COLOR=BLUE]MyBase[/COLOR].Closing
        Owner.Show()
        [COLOR=BLUE]Me[/COLOR].Close()
    [COLOR=BLUE]End[/COLOR] [COLOR=BLUE]Sub[/COLOR]

the Owner bit replaces the modified new sub eg:

Quote:

---

Public Sub New(ByVal frm As Form)
MyBase.New()
pform = frm

---

^^^^ becomes...

Quote:

---

Dim frmMain As Form1 = Owner

---

Thanks, I will test your code, but as i stated before, you dont need to have two forms to note the bug(?). Just in a single form load event (Startup form) put the following code:

VB Code:

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Me.Opacity = 0.1 
        Me.Opacity=1 ' This does not make any difference in showing icon in taskbar
End Sub

And you see that the form is not shown in taskbar.

strange , i just tried the following in a single form and it still showed up in the taskbar as it should do...

VB Code:

[COLOR=BLUE]Private[/COLOR] [COLOR=BLUE]Sub[/COLOR] Form1_Load([COLOR=BLUE]ByVal[/COLOR] sender [COLOR=BLUE]As[/COLOR] System.Object, [COLOR=BLUE]ByVal[/COLOR] e [COLOR=BLUE]As[/COLOR] System.EventArgs) [COLOR=BLUE]Handles[/COLOR] [COLOR=BLUE]MyBase[/COLOR].Load      
    [COLOR=BLUE]Me[/COLOR].Opacity = 0.5
[COLOR=BLUE]End[/COLOR] [COLOR=BLUE]Sub[/COLOR]

Yes, strange, as i am testing here and facing various results, sometimes its shown and sometimes not!!!!!

dynamic_sysop:
Your code still does not show the form2 in taskbar and on closing form2 breaks with StackOverFlowException. If you change frm.Show()
to frm.ShowDialog the error does not happen but still form2 is not shown in taksbar.