Hi Mike,

good hearing from you, I hope you are doing fine.

Here is the InitializeRow code:

void grdBalance_InitializeRow(object sender, InitializeRowEventArgs e)
{
    if (e.Row.GetType() == typeof(UltraGridRow))
    {
 
        // checking flag-state
        ParsedBalanceStorageListEntry entry = e.Row.ListObject as ParsedBalanceStorageListEntry;
 
 
 
        int count = GetCountFromItem(entry);
        if (count == 0)
        {
            e.Row.Cells[TrafficLightColumnKey].Appearance = RedMarkerAppearance;
            return;
        }
 
        if (count == 1)
        {
            e.Row.Cells[TrafficLightColumnKey].Appearance = GreenMarkerAppearance;
            return;
        }
        e.Row.Cells[TrafficLightColumnKey].Appearance = YellowMarkerAppearance;
        return;
 
 
    }
}

 ...and the stuff related to the appearances I use:

private Appearance _greenMarkerAppearance;
private Appearance GreenMarkerAppearance
{
    get
    {
        if (_greenMarkerAppearance == null)
        {
            _greenMarkerAppearance = GetDefaultTrafficLightAppearance("GreenMarkerAppearance");
            _greenMarkerAppearance.Image = GlobalResources.Images.Misc.Flags.NonCountryFlags.NonCountryFlagsImageProvider.FlagGreen.ResizeTo(new Size(16, 16));
        }
        return _greenMarkerAppearance;
    }
}
 
private Appearance _redMarkerAppearance;
private Appearance RedMarkerAppearance
{
    get
    {
        if (_redMarkerAppearance == null)
        {
            _redMarkerAppearance = GetDefaultTrafficLightAppearance("RedMarkerAppearance");
            _redMarkerAppearance.Image = GlobalResources.Images.Misc.Flags.NonCountryFlags.NonCountryFlagsImageProvider.FlagRed.ResizeTo(new Size(16, 16));
        }
        return _redMarkerAppearance;
    }
}
 
private static Appearance GetDefaultTrafficLightAppearance(string key)
{
    Appearance appearance = new Appearance(key);
    appearance.ImageHAlign = HAlign.Center;
    appearance.ImageVAlign = VAlign.Top;
 
    return appearance;
}

I use this to meet the guidelines I read about in your UltraGrid Tuning-Tips article for reusing appearances.

We are currently using version 11.2.20112.1010, so I assume that is already a version where the mentioned bug was fixed ;)

Let me know if you need any further information.

Best regards and have a great day
Andy 

Hi,

I don't see anything wrong with this code that would cause a problem - assuming that GetCountFromItem is correct - and there's no reason to think it isn't.

My only guess at this point is that maybe the fact that the grid is processing the data source operations asynchronously is causing things to get out of synch. To test that theory, after you remove the row from the data source, try adding this:

grid.Update();

grid.Rows.Refresh(FireInitializeRow);

If that doesn't correct the cell appearance, then I'm not sure what's going on. Could you post a small sample project demonstrating the behavior so we can check it out?

Oh, just had one other thought - you're not using any other threads in this application, are you? If your data source or the grid was being influenced by a background thread, that could cause this.

Hi Mike,
thanks a lot for your reply, I am going to test what you proposed and let you know how it worked out.
Unfortunately I will be able to do this at the earliest of Monday.

I didn't implement the Update/Refresh because I could see the entry disappear from the list upon removal and I didn't even recognize the problem until the testers could get a hand on it..

I just have one concern regarding this, because the routine for GetCountFromItem is quite heavy weighted, but I am pretty sure if this approach works I can implement buffering or anything alike to make this less heavy.

By the way, I do not use threads in this project, so this shouldn't interfere with the grid.

Thanks again Mike and have a great weekend
best regards
Andy