Tried it in VB.NET Winforms app, but no luck. It's still shown in the alt-tab menu:
Protected Overrides ReadOnly Property CreateParams As System.Windows.Forms.CreateParams
Get
Dim cp As CreateParams = MyBase.CreateParams
cp.ExStyle = cp.ExStyle Or &H80
Return cp
End Get
End Property
An easier way to do this is:
Me.FormBorderStyle = FormBorderStyle.SizableToolWindow
Me.ShowInTaskbar = False
Just like it mentions in this article,
The original author's... since the tip doesn't work, I hate to say "it looks like you've just copied & pasted" :doh: