No titles on docking panes at all in C#

Very hard to say without your project.  I'll point out some things you might have missed.

few things:

In MDI you need:

            foreach (Control ctrl in this.Controls)
            {
                if (ctrl is MdiClient)
                {                                                                       
                    CommandBars.SetMDIClient(ctrl.Handle.ToInt32());
                }
            }

            MDIDockingPaneManager.SetCommandBars (CommandBars.GetDispatch());
            MDIDockingPaneManager.Options.ThemedFloatingFrames = true;

            foreach (Control ctrl in this.Controls)
            {
                if (ctrl is MdiClient)
                {                                                                       
                    MDIDockingPaneManager.SetMDIClient(ctrl.Handle.ToInt32());
                }
            }

to see stickers you must show them:

            MDIDockingPaneManager.Options.ShowDockingContextStickers = true;
            MDIDockingPaneManager.Options.StickerStyle = XtremeDockingPane.DockingContextStickerStyle.StickerStyleVisualStudio2005;
            MDIDockingPaneManager.Options.AlphaDockingContext = true;

each subform with CB and DP must have this set before panes created and after CB created:
ChildDockingPaneManager.SetCommandBars (CommandBars.GetDispatch());

for mdi child there is a different way needed for our controls, for normal forms\not mdi child this is not needed:

When .NET switch from standard frame to MDI Child Frame it recreates window and kills our CommandBars and panes. Please read through this entire post as it contains several important things you need to do to get the Commandbars 100% functional. Hope this helps.

Here is a work around for so you can work with it like normal, meaning simply drop the CB or DP on your MDI Child form and use code below (note there is other ways around it, but all are much messier)

//***********************
//********Note 1**********
//***********************

//Add a public method in MDI child:

    public void RestoreCommandBars()
    {
      CommandBars.AttachToWindow(this.Handle.ToInt32());

      CommandBars.Icons = frmMain.Instance.ImageManager.Icons;

      CommandBar StandardBar = CommandBars.Add("Standard", XTPBarPosition.xtpBarTop);
      CommandBarPopup ControlNew = (CommandBarPopup)AddButton(StandardBar.Controls, XTPControlType.xtpControlSplitButtonPopup, ID.FILE_NEW_PROJECT, "New");
      AddButton(ControlNew.CommandBar.Controls, XTPControlType.xtpControlButton, ID.FILE_NEW_PROJECT, "New Project");
      AddButton(ControlNew.CommandBar.Controls, XTPControlType.xtpControlButton, ID.FILE_NEW_BLANK, "New Blank Solution");
      CommandBarPopup ControlItem = (CommandBarPopup)AddButton(StandardBar.Controls, XTPControlType.xtpControlSplitButtonPopup, ID.PROJECT_NEW, "New Item");
      AddButton(ControlItem.CommandBar.Controls, XTPControlType.xtpControlButton, ID.PROJECT_NEW, "Add New Item");
      AddButton(ControlItem.CommandBar.Controls, XTPControlType.xtpControlButton, ID.PROJECT_EXIST, "Add Existin&g Item...");
      AddButton(ControlItem.CommandBar.Controls, XTPControlType.xtpControlButton, ID.PROJECT_ADD_CLASS, "Add Class...");
    }

        public void RestorePanes()
        {
            DockingPaneManager.AttachToWindow(this.Handle.ToInt32());
            DockingPaneManager.SetCommandBars (CommandBars.GetDispatch());

            DockingPaneManager.ScaleMode = XtremeDockingPane.XTPScaleMode.xtpScalePixel;

            Pane PaneProperties;
            PaneProperties = this.DockingPaneManager.CreatePane(1, 210, 120, XtremeDockingPane.DockingDirection.DockLeftOf, null);
            PaneProperties.Title = "Properties";

            rtfTextBox.Text = "This is a MDI Child form that contains a Docking Pane.  The procedure to accomplish this is different than simply displaying a 'normal' child form.  To see how to display a Docking Pane on a 'normal' child form click the 'Child Form with Docking Pane' button on the toolbar.";
        }

//And call it after you create MDI child:
      frmDocument frmDocument = new frmDocument();
      frmDocument.MdiParent = this;
      frmDocument.Show();
      frmDocument.Text = "Document " + lDocumentCount.ToString();
      frmDocument.RestoreCommandBars();
      frmDocument.RestorePanes();

//***********************
//********Note 2**********
//***********************

Another important thing to consider is .NET will rename our CommandBars Resize event to "ResizeEvent". So you will want to use "ResizeEvent" instead of "Resize".

this.axCommandBars.ResizeEvent += new System.EventHandler(this.axCommandBars_ResizeEvent);

    private void CommandBars_ResizeEvent(object sender, EventArgs e)
    {
      System.Diagnostics.Debug.Write("CB Resize");
    }

//***********************
//********Note 3**********
//***********************

If you use ImageManager you will want to keep it on the main form and reference it. Just have your image manager on the main MDI form and reference it in child like this:

CommandBars.Icons = frmMain.Instance.ImageManager.Icons;


//***********************
//********Note 4**********
//***********************

If you set EnableGroups to True don't set child form state to Maximized, the Workspace will manually reposition it to allow create multiple groups. If set to Maximized you will see allot of flicker. You might then have to manually resize the child windows to fill the workspace and hide the titlebar.  

Thanks for your detailed message.  Unfortunately, I am already doing all of this in the code.  Can you give me your email address so that I can email you the project?  My company won't allow me to post it to a public forum since it contains proprietary code.

I found the problem.  We are evaluating a VB6 to C# converter.  The converter generated incorrect code for setting the .Options properties on the panes.  Once I fixed it, everything works.  Sorry to have bothered you.