Looks like you guys have a nasty little bug in here that is causing a memory leak.

 If you remove the pane, or dispose of it, the control is removed from ControlPanes OK. However, if the pane is a tabbed MDI Window  then the internal MDIChildForms of the UltraDockManager is not cleared of the pane and it will therefore never be disposed causing a memory leak. This collection just keeps growing and growing as the user opens and closed new windows. 

I have found NO WORKAROUND for this and it's KILLING my app. HELP!

The following code is used to create a test window:

             Control ctrl = new TextBox();
            ctrl.Dock = DockStyle.Fill;
            DockAreaPane areaDock = ultraDockManager1.DockControls(new Control[ { ctrl },
                DockedLocation.Floating, ChildPaneStyle.TabGroup);

            DockableControlPane pane = areaDock.Panes[0] as DockableControlPane;
            count++;
            pane.Text = "Foo " + count.ToString() ;
            pane.Key = pane.Text;
            pane.Settings.AllowClose = Infragistics.Win.DefaultableBoolean.True;
            pane.Settings.AllowFloating = Infragistics.Win.DefaultableBoolean.True;
            pane.IsMdiChild = true;
            pane.Settings.AllowDockAsTab = Infragistics.Win.DefaultableBoolean.True;
            pane.Settings.AllowDockBottom =
                pane.Settings.AllowDockLeft =
                pane.Settings.AllowDockRight =
                pane.Settings.AllowDockTop = Infragistics.Win.DefaultableBoolean.False;
            pane.Activate();
 

using the following code to clean up:

        private void DestroyClosedPanes()
        {
            foreach (DockableControlPane pane in ultraDockManager1.ControlPanes)
            {
                if (pane.Closed)
                {
                    if (pane.Control != null)
                        pane.Control.Dispose(); //removes from DockManager collections
                   pane.Dispose();
                }
            }
        }

        private void ultraTabbedMdiManager1_TabClosed(object sender, Infragistics.Win.UltraWinTabbedMdi.MdiTabEventArgs e)
        {
            DestroyClosedPanes();
        }