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How to save/load the state information in a form which contains both the TabbedMDIManager and the DockingManager?

Platform: WinForms |
Control: DockingManager |
Published Date: April 30, 2011 |
Last Revised Date: July 10, 2014


In General, the MDIChild states are maintained by the TabbedMDIManager. The DockingManager persists information about whether a particular window is an MDIChild or not. Hence the DockingManager’s PersistState property will not persist the TabbedMDI state and this has to be done through the TabbedMDIManager’s SaveTabGroupStates or LoadTabGroupStates methods.


It is always better to call the TabbedMDIManager’s SaveTabGroupStates method, from Form.WndProc method. This has to be done in response to the WM_CLOSE message. This will force the TabbedMDIManager to persist the MDIChild state before the DockingManager has a chance to clear it up.


The TabbedMDIManager’s LoadTabGroupStates method should be invoked from the DockingManager’s NewDockStateEndLoad event. This event get fired after the docking windows state has been loaded.

Now the persisted TabbedMDI state should be applied to MDIChild forms. Please refe rthe below code snippet which illustrates this:


protected override void WndProc(ref Message m)


if(m.Msg == 0x0010/*WM_CLOSE*/)


// Save the TabbedMDIManager state before the Form gets a chance to generate the Closing event



base.WndProc(ref m);


private void dockingManager1_NewDockStateEndLoad(object sender, System.EventArgs e)





Protected Overrides Sub WndProc(ByRef m As Message)

if(m.Msg == 0x0010/*WM_CLOSE*/)

If m.Msg = &H0010 Then

' Save the TabbedMDIManager state before the Form gets a chance to generate the Closing event


End If


End Sub

Private Sub dockingManager1_NewDockStateEndLoad(ByVal sender As Object, ByVal e As System.EventArgs) Handles dockingManager1.NewDockStateEndLoad


End Sub



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