Panel flickers when pressing tab or alt keys

Question

Hi all,

I have two panels (without images) in the main form, when the program loads there is no problem, but if I press the "tab" or "alt" keys the 2 panels flicker but just once, if I press again the keys nothing happens.

So far I tried:

 - Add the form's DoubleBuffered = True

 - Created my own panel using:

Public Class MyPanel
    Inherits Panel

    Public Sub New()
        Me.SetStyle(ControlStyles.AllPaintingInWmPaint, True)
        Me.SetStyle(ControlStyles.ResizeRedraw, True)
        Me.SetStyle(ControlStyles.UserPaint, True)
        Me.SetStyle(ControlStyles.OptimizedDoubleBuffer, True)
    End Sub
End Class

But nothing seems to work, any ideas?

Thanks in advance.

---

G.Waters

Answer 1

Well, since no one contributes, I had to make the form again from scratch and for some reason flicker disappeared, so my conclusion is that the designer file ordered the elements in the wrong way :(

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G.Waters

Answer 2

Hi George Waters,

I've made a simple Form (DoubleBuffers=True) with two Panels and one TextBox is in each Panel.
And added a Class "MyClass" that had the same code as you showed.

No flickers on those Panels when I pressed [Ctrl] or [Alt].

I suppose there are something that you have not described.e.g. what kind of controls are there in your Panels?
Please explain more details.
____________
Ashidacchi

Answer 3

After lots of time making the form again, I noticed that I had this property in order to show the form in the working area correctly (since it's a borderless form), this was the cause:

Protected Overrides ReadOnly Property CreateParams() As CreateParams
        Get
            Dim CP As CreateParams = MyBase.CreateParams
            CP.Style = &HA0000
            Return CP
        End Get
End Property

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G.Waters

Answer 4

Hi George,

It seems that you have solved your issue by yourself, please remember to close your thread by marking your post as answer, it is very beneficial to the other communities who face the same issue.

Thanks for your understanding.

Best regards,

Cherry Bu

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