Telerik Wincontrols Flickering

3 posts, 0 answers
  1. tayyab
    tayyab avatar
    1 posts
    Member since:
    Oct 2010

    Posted 08 Oct 2010 Link to this post

    I am new to Telerik thing and working on an application using Telerik WinForm controls. I am adding user controls dynamically into a panel based on options selected in the main tree. One such user control constitutes a detailed form having lots of fields.

    below is the way I am displaying the user control in a panel:



    loEntityForm = 


    new EntityForm(_OwnerID); // User control to be added dynamically  



    pnlResourceRight.Controls.Clear(); // Clearing existing user controls if any







    loEntityForm.Dock = 









    Now this loEntityForm flickers a lot before being properly rendered.

    I have used already used one possible slolution in the contructor








    ControlStyles.UserPaint, true);





    ControlStyles.AllPaintingInWmPaint, true);





    ControlStyles.DoubleBuffer, true);











    but it doesn't solve my problem. Please suggest. 



  2. Richard Slade
    Richard Slade avatar
    3000 posts
    Member since:
    May 2009

    Posted 12 Oct 2010 Link to this post


    What is going on in the user control? It sounds like you are probably adding in a lot of items and refreshing the control? 
    However, I wrote a small SQL editor with some rad controls a while ago and had a flickering issue. I solved it by doing this... 

    Declare a Nativemethod class
    ''' <summary>Native Methods.</summary>
    ''' <remarks></remarks>
    Friend NotInheritable Class NativeMethods
    #Region "Constructor"
        ''' <summary>Prevents initialisation of a new instance of the NativeMethods class.</summary>
        ''' <remarks></remarks>
        Private Sub New()
        End Sub
    #End Region
        ''' <summary>Send Message.</summary>
        ''' <param name="hWnd"></param>
        ''' <param name="wMsg"></param>
        ''' <param name="wParam"></param>
        ''' <param name="lParam"></param>
        ''' <returns></returns>
        ''' <remarks></remarks>
        Friend Declare Function SendMessage Lib "User32" Alias "SendMessageA" (ByVal hWnd As IntPtr, _
            ByVal wMsg As Integer, _
            ByVal wParam As Integer, _
            ByVal lParam As Integer) As Integer
        ''' <summary>Lock Window Update.</summary>
        ''' <param name="hWnd"></param>
        ''' <returns></returns>
        ''' <remarks></remarks>
        Friend Declare Function LockWindowUpdate Lib "User32" (ByVal hWnd As Integer) As Integer
    End Class

    Before updating the control
    ' Lock the update

    then make your updates to the control
    and then unlock
    ' Unlock the update

    Sorry it's in VB, but it should be fairly staightforward to convert. 
    Hope that helps
  3. Vassil Petev
    Vassil Petev avatar
    1765 posts

    Posted 13 Oct 2010 Link to this post

    Hi tayyab,

    Could you share which version of RadControls are you using? We used to have flickering issues in old versions of the controls, which should have been addressed by now.

    Kind regards,
    the Telerik team
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