VB.NET - Background fade like in the UAC message?

Question

Hello,

When the UAC message is displayed in Windows Vista, 7 or 8 the background becomes inaccessible until the user selects from the message dialog. Ca

Answer 1

That's pretty easy to do, just display a black borderless form with opacity and the dialog on top of it. Do keep in mind that this of course cannot provide the same level as protection as the UAC prompt provides, you cannot use the secure desktop yourself.

Public Shared Function Plexiglass(dialog As Form) As DialogResult
    Using plexi = New Form()
        plexi.FormBorderStyle = FormBorderStyle.None
        plexi.Bounds = Screen.FromPoint(dialog.Location).Bounds
        plexi.StartPosition = FormStartPosition.Manual
        plexi.AutoScaleMode = AutoScaleMode.None
        plexi.ShowInTaskbar = False
        plexi.BackColor = Color.Black
        plexi.Opacity = 0.45
        plexi.Show()
        dialog.StartPosition = FormStartPosition.CenterParent
        Return dialog.ShowDialog(plexi)
    End Using
End Function

Tweak the Opacity value as desired, the higher the value the darker the background. Looks like this on a little test program: