Flickering when resizing a C1.Win.Ribbon.C1RibbonForm

Posted by: wknauf on 7 February 2021, 11:43 pm EST

  • Posted 7 February 2021, 11:43 pm EST

    The new C1RibbonForm in “C1.Win.Ribbon.4.5.2” dll flickers when redrawing.

    See attached sample (originally created for another support question): when resizing the form, there is a lot of flickering and sometimes the background behind the ribbonform is partially visible instead of the ribbon.

    This happens for me only when in a RDP session (due to home office). On my real machine, I do not see flickering. But as our app is also installed in terminalserver enviroments, this might happen for our customers too - currently we still use the old C1Ribbon.


    Best regards


  • Posted 8 February 2021, 7:57 pm EST

    Hi Wolfgang,

    We have escalated this issue to the development team and will let you know when we have an update.

    Regards. Avnish

    [Internal Tracking ID: C1WIN-24371]

  • Posted 9 February 2021, 2:25 am EST

    I noticed the same when resizing a C1FlexViewer which I believe uses the new ribbon. -Kingman

  • Posted 9 February 2021, 4:02 pm EST

    Hi Kingman,

    Thank You for bringing this to our attention, we have escalated this to the development team and will let you know when we have an update.

    Regards. Avnish.

  • Posted 8 June 2021, 5:27 am EST

    Is there an update regarding this issue. In my case, the C1Ribbon, both old and new, are flickering when used in its minimized state. The wordpad app in the Component One samples does this.

  • Posted 8 June 2021, 3:58 pm EST


    The issue is on the to-do list of the development team. We do not have any ETA for this yet. We will let you know as soon as there is any update regarding this.

    Regards. Avnish

  • Posted 10 November 2021, 7:19 pm EST

    What about this issue?

    Best regards


  • Posted 10 November 2021, 10:49 pm EST

    Hi Wolfgang,

    The issue is on the to-do list of the dev team. The dev team needs some time to research and work on this issue as it is not an easy fix and will need changes in the resize logic.

    We will update you as soon as we have any information from the dev team.

    Regards Avnish

  • Posted 19 June 2022, 8:22 pm EST

    Any updates on this?

    Best regards


  • Posted 19 June 2022, 9:49 pm EST

    Hi Wolfgang,

    We are getting in touch with the development team to get information about the fix for the issue. We will update you as soon as possible.

    Kind Regards, Kartik

  • Posted 17 January 2023, 6:46 pm EST

    Any updates?

    Attached is a reworked example, using a project with target frameworks Net 4.8 and .NET6 - the issue happens for both of them.


    Best regards


  • Posted 18 January 2023, 6:20 pm EST

    Hi Wolfgang,

    The development team is currently researching and working on the issue. The ETA for the fix is the 2023v2 release.

    Thanks, and Best Regards,


  • Posted 27 April 2023, 4:45 am EST

    I’m also having serious flickering issues with a C1BackstageVIew whenever I resize. Any suggestions for how to prevent it? I have tried using SuspendLayout and ResumeLayout in the OnResizeBegin and OnResizeEnd of my form, but no such luck.

  • Posted 27 April 2023, 3:28 pm EST

    Hi Andrew,

    We could also see the flickering issue when resizing the Form with BackstageView open. Unfortunately, there is no workaround for this behavior currently. We have reported the observations to the development team for further investigation and will let you know the updates as soon as possible.

    Best Regards,


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