c# - During FlowLayoutPanel scrolling, background distorts + flickers

Question

I have a windows form application that has a background. Within it, I have a flowlayoutpanel with a transparent background. When I scroll, the following happens:

I also see some flickering. I've tried all the doublebuffered business, and it doesn't work.

Any suggestions?

Answer 1

this is what worked for me.

public class CustomFlowLayoutPanel : FlowLayoutPanel
{
    public CustomFlowLayoutPanel()
        : base()
    {
        this.SetStyle(ControlStyles.UserPaint, true);
        this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
        this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
    }

    protected override void OnScroll(ScrollEventArgs se)
    {
        this.Invalidate();

        base.OnScroll(se);
    }
    protected override CreateParams CreateParams
    {
        get
        {
            CreateParams cp = base.CreateParams;
            cp.ExStyle |= 0x02000000; // WS_CLIPCHILDREN
            return cp;
        }
    }
}