Telerik Wincontrols Flickering

[tayyab]

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

 

 

 

pnlResourceRight.Controls.Add(loEntityForm);

 

 

loEntityForm.Dock = 

 

DockStyle.Fill;

 

 

 

 

 

 

Now this loEntityForm flickers a lot before being properly rendered.

I have used already used one possible slolution in the contructor

i.e
 

 

 

 

InitializeComponent();

SetStyle(

 

ControlStyles.UserPaint, true);

 

 

SetStyle(

 

ControlStyles.AllPaintingInWmPaint, true);

 

 

SetStyle(

 

ControlStyles.DoubleBuffer, true);

 

 

SetStyle(

 

ControlStyles.ResizeRedraw);

 

 

 

 

 

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

 

 

[Richard Slade]

Hi, 

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

NativeMethods.LockWindowUpdate(Me.Handle.ToInt32)

then make your updates to the control
and then unlock

' Unlock the update
NativeMethods.LockWindowUpdate(0)

Sorry it's in VB, but it should be fairly staightforward to convert. 
Hope that helps
Richard

[Vassil Petev]

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,
Vassil
the Telerik team