For MDI child you must move all code from Designer to OnLoad:

this.DockingPaneManager = new AxXtremeDockingPane.AxDockingPane();

   this.DockingPaneManager.Location = new System.Drawing.Point(8, 32);
   this.DockingPaneManager.Name = "DockingPaneManager";
   this.DockingPaneManager.Size = new System.Drawing.Size(24, 24);
   this.DockingPaneManager.TabIndex = 2;
   this.DockingPaneManager.ResizeEvent += new System.EventHandler(this.DockingPaneManager_ResizeEvent);
   this.DockingPaneManager.AttachPaneEvent += new AxXtremeDockingPane._DDockingPaneEvents_AttachPaneEventHandl er(this.DockingPaneManager_AttachPaneEvent);
   this.DockingPaneManager.GetClientBordersWi dth += new AxXtremeDockingPane._DDockingPaneEvents_GetClientBordersWidt hEventHandler(this.DockingPaneManager_GetClientBordersWidth) ;
   this.DockingPaneManager.Action += new AxXtremeDockingPane._DDockingPaneEvents_ActionEventHandler(t his.DockingPaneManager_Action);

this.Controls.Add (DockingPaneManager);

I'm having somewhat of the same type of problem in VB.Net.  I tried your fix and either I didn't implement it correctly or it doesn't fix my problem.  I have attached a sample of my project.  Any help you can provide would be greatly appreciated.

https://forum.codejock.com/uploads/Countryboy/2006-04-06_085910_Sample_Frame.zip - 2006-04-06_085910_Sample_Frame.zip

Thanks

Ok, lets try again:

The problem:

When you call frmPluginForm.MdiParent = MDIForm

.NET destroy frame and create again with WS_EX_MDICHILD style, so all commandbarrs and dockingpanes objects destroyed. Unfortunatelly from ActiveX code We can't catch this event end recreate them.

The solution

Solution is to create DockingPane and CommandBars after you call it

Sample

create InitBars method and call it after you change frame style:

Public Sub InitBars()

Me.AxDockingPane1 = New AxXtremeDockingPane.AxDockingPane

Me.AxCommandBars1 = New AxXtremeCommandBars.AxCommandBars

CType(Me.AxDockingPane1, System.ComponentModel.ISupportInitialize).BeginInit()

CType(Me.AxCommandBars1, System.ComponentModel.ISupportInitialize).BeginInit()

'

'AxDockingPane1

'

Me.AxDockingPane1.Enabled = True

Me.AxDockingPane1.Location = New System.Drawing.Point(24, 32)

Me.AxDockingPane1.Name = "AxDockingPane1"

Me.AxDockingPane1.Size = New System.Drawing.Size(17, 16)

Me.AxDockingPane1.TabIndex = 0

'

'AxCommandBars1

'

Me.AxCommandBars1.Enabled = True

Me.AxCommandBars1.Location = New System.Drawing.Point(8, 56)

Me.AxCommandBars1.Name = "AxCommandBars1"

Me.AxCommandBars1.Size = New System.Drawing.Size(24, 24)

Me.AxCommandBars1.TabIndex = 1

Me.Controls.Add(Me.AxCommandBars1)

Me.Controls.Add(Me.AxDockingPane1)

CType(Me.AxDockingPane1, System.ComponentModel.ISupportInitialize).EndInit()

CType(Me.AxCommandBars1, System.ComponentModel.ISupportInitialize).EndInit()

Dim paneA As Pane = AxDockingPane1.CreatePane(1, 200, 120, DockingDirection.DockLeftOf, Nothing)

Dim paneB As Pane = AxDockingPane1.CreatePane(2, 200, 120, DockingDirection.DockRightOf, paneA)

'AxDockingPane1.Options.HideClient = True

'AxDockingPane1.Options.ShowCaption = False

AxDockingPane1.Options.ThemedFloatingFrames = True

AxDockingPane1.Options.LunaColors = False

AxDockingPane1.SetCommandBars(Me.AxCommandBars1.GetDispatch)

End Sub