Hi Geoff, 

This code worked for me when I tested it out. Did you try stepping through the Dialog_Shown event and examining the coords being used for the DesktopBounds?

Make sure you are using Form_Shown and not some other event like Form_Load, because the grid code is setting the location of the dialog, so you have to use Shown so that you are setting the location AFTER the grid does. 

Hi Motoki

Unfortunately that does not work, still always showing the column chooser on the main primary display\screen.

Regards

Geoff

Hello Geoff

Thanks for your post.
It looks like a bug. The ColumnChooser remember the last location the used put it. So if it comes up on the wrong monitor and they move it to the current monitor, it will henceforth display where they moved it for the life of the application. But the initial display doesn’t take the location of the owning form into account.

I will log this issue to our development department and continue to follow as the support case. Please kindly take care of our notice.
In the meantime, you can work around it like so:

        private void UltraGrid1_BeforeColumnChooserDisplayed(object sender, BeforeColumnChooserDisplayedEventArgs e)
        {
            var screen = Infragistics.Win.Utilities.ScreenFromRectangle(this.Bounds);
            if (!screen.Bounds.Contains(e.Dialog.Bounds))
            {
                e.Dialog.Shown += Dialog_Shown;
            }
        }

        private void Dialog_Shown(object sender, EventArgs e)
        {
            var dialog = (Form)sender;
            dialog.Shown -= Dialog_Shown;
            var screen = Infragistics.Win.Utilities.ScreenFromRectangle(this.Bounds);
            dialog.DesktopBounds = new Rectangle(
                 screen.Bounds.X,
                 screen.Bounds.Y,
                 dialog.Bounds.Width,
                 dialog.Bounds.Height
                 );
        }

Sincerely,
Motoki.