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();
        }
 

I tried this as well and it does not work.   The pane is still in the collection forever with an empty key name (it appears that way when I examine the collection.  Yet when I try to add a new pane with the name of the one removed (that is now empty) I get the error that the key exists already.  I am very confused as to how to do what seems would be a very simple thing - delete, destroy a pane that is hosting a control.  Can you help me understand how to remove a pane (not just close the pane)

I agree. The pane is still in the collection. I have tried to Close the pane, Dispose the pane, and RemoveAt from the DockableControlPanesCollection. Nothing works that I have found. What I need is an example of the code to permanently remove a pane.    

Is this issue fixed, I am running in to the same issue as reported here. 

I guess the bug is still present in version 10.2 ???

Here is my code

if (_groupList.Panes.Exists(key))

 {

             DockableControlPane pan = _groupList.Panes[key] as DockableControlPane;                      

            _groupList.Panes.Remove(key);

             pan.Dispose(); //???

}

if (!_groupList.Panes.Exists(key))

{

       UserControl uc = ....

       DockableControlPane pan = new DockableControlPane(key, title, uc); 

                _groupList.Panes.Add(pan); >>> bang, key already exists although the panes collection is emtpy ???

Is there any reasonable workaround ????