nullreferenceexception- dockingpanel help...

I am having the same problem. It seems that I get the NullReferenceException error when I set the MDIParent of the form that contains the DockingPanes. If I remove that line then the form launches fine.

Now the question is, can the docking panes NOT be used on a child form in an MDI app?

Product: Xtreme SuitePro ActiveX 2009 (13.0.0)
Platform: Windows XP (32bit) - SP 3
Language: C#, VS2005

dear all:

i meet an an err: System.NullReferenceException:Objec reference not set to an instance of an object when

show a child form with dockingpanel and commandbar control in a mdi form.

step1: create a mdi form "MDIParent1" with menu item "new form"

step2: create another form "Form1"

step3: put a dockingpanel and commandbar control in form1, put another two RichTextBoxs as panels

step4: code in form1 is follows:

Public Class Form1

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim Control, CtlProject As XtremeCommandBars.CommandBarControl

        CtlProject = wndAxCommandBars.ActiveMenuBar.Controls.Add(XtremeCommandBars.XTPControlType.xtpControlPopup, 100, "New", -1, False)
        With CtlProject.CommandBar.Controls
            Control = .Add(XtremeCommandBars.XTPControlType.xtpControlButton, 200, "Exit")
            Control.BeginGroup = True
            Control = .Add(XtremeCommandBars.XTPControlType.xtpControlButton, 300, "Login")
            Control.BeginGroup = True
        End With

        wndAxDockingPane.SetCommandBars(wndAxCommandBars.GetDispatch)
        wndAxDockingPane.Options.HideClient = True
        Dim panA, panB As XtremeDockingPane.Pane
        panA = wndAxDockingPane.CreatePane(1, 220, 1200, XtremeDockingPane.DockingDirection.DockLeftOf, Nothing) '
        panA.title = "This pane1"

panB = wndAxDockingPane.CreatePane(2, 220, 1200, XtremeDockingPane.DockingDirection.DockBottomOf, panA) '
panB.title = "This pane1"

End Sub

    Private Sub wndAxDockingPane_AttachPaneEvent(ByVal sender As System.Object, ByVal e As AxXtremeDockingPane._DDockingPaneEvents_AttachPaneEvent) Handles wndAxDockingPane.AttachPaneEvent
        Select Case e.item.Id
            Case 1 : e.item.Handle = RichTextBox1.Handle.ToInt32
            Case 2 : e.item.Handle = RichTextBox2.Handle.ToInt32
        End Select
    End Sub
End Class

step5: code in MDIParent1 is follows:

Imports System.Windows.Forms

Public Class MDIParent1

    Private Sub ShowNewForm(ByVal sender As Object, ByVal e As EventArgs) Handles NewToolStripMenuItem.Click, NewToolStripButton.Click
        Dim ChildForm As New Form1
        ChildForm.MdiParent = Me

        Static Dim m_ChildFormNumber As Integer
        m_ChildFormNumber += 1
        ChildForm.Text = "Doc - " & m_ChildFormNumber

ChildForm.Show()
End Sub
End Class

step5: when startwith form1, every thing runs well, includes the commandbar and dockingpanel control

step6: when start with MDIParent1 , it shows the form1 as a child form, when use the commandbar and dockingpanel control,

error occurs:

err1: with commandbar

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim Control, CtlProject As XtremeCommandBars.CommandBarControl

CtlProject = wndAxCommandBars.ActiveMenuBar.Controls.Add(XtremeCommandBars.XTPControlType.xtpControlPopup, 100, "New", -1, False)

----->System.NullReferenceException:Objec reference not set to an instance of an object

err2: with dockingpanel

Dim Control, CtlProject As XtremeCommandBars.CommandBarControl

        'CtlProject = wndAxCommandBars.ActiveMenuBar.Controls.Add(XtremeCommandBars.XTPControlType.xtpControlPopup, 100, "New", -1, False)
        'With CtlProject.CommandBar.Controls
        '    Control = .Add(XtremeCommandBars.XTPControlType.xtpControlButton, 200, "Exit")
        '    Control.BeginGroup = True
        '    Control = .Add(XtremeCommandBars.XTPControlType.xtpControlButton, 300, "Login")
        '    Control.BeginGroup = True
        'End With

        wndAxDockingPane.SetCommandBars(wndAxCommandBars.GetDispatch)
        wndAxDockingPane.Options.HideClient = True
        Dim panA, panB As XtremeDockingPane.Pane
        panA = wndAxDockingPane.CreatePane(1, 220, 1200, XtremeDockingPane.DockingDirection.DockLeftOf, Nothing) '
        panA.title = "This pane1"----->System.NullReferenceException:Objec reference not set to an instance of an object

-------------------------------------

Visual Studio 2005 8.0.50727.42

Visual Basic Project

.net framework 2.0.50727

Codejock13.2.1 ActiveX

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
modwyer8 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 10 June 2009 Status: Offline Points: 4	Post Options Post Reply Quote modwyer8 Report Post Thanks(0) Quote Reply Topic: nullreferenceexception- dockingpanel help... Posted: 03 June 2010 at 12:39pm
	I am having the same problem. It seems that I get the NullReferenceException error when I set the MDIParent of the form that contains the DockingPanes. If I remove that line then the form launches fine. Now the question is, can the docking panes NOT be used on a child form in an MDI app?
	Product: Xtreme SuitePro ActiveX 2009 (13.0.0) Platform: Windows XP (32bit) - SP 3 Language: C#, VS2005

nvierros Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 02 July 2006 Location: Australia Status: Offline Points: 44	Post Options Post Reply Quote nvierros Report Post Thanks(0) Quote Reply Posted: 19 April 2010 at 5:59am
	panA.title = "This pane1"----->System.NullReferenceException:Objec reference not set to an instance of an object Hi, I also have this error, is there a resolution? Cheers

Jack.Lau Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 13 January 2010 Status: Offline Points: 10	Post Options Post Reply Quote Jack.Lau Report Post Thanks(0) Quote Reply Posted: 11 February 2010 at 10:42pm
	dear all: i meet an an err: System.NullReferenceException:Objec reference not set to an instance of an object when show a child form with dockingpanel and commandbar control in a mdi form. step1: create a mdi form "MDIParent1" with menu item "new form" step2: create another form "Form1" step3: put a dockingpanel and commandbar control in form1, put another two RichTextBoxs as panels step4: code in form1 is follows: Public Class Form1 Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Dim Control, CtlProject As XtremeCommandBars.CommandBarControl CtlProject = wndAxCommandBars.ActiveMenuBar.Controls.Add(XtremeCommandBars.XTPControlType.xtpControlPopup, 100, "New", -1, False) With CtlProject.CommandBar.Controls Control = .Add(XtremeCommandBars.XTPControlType.xtpControlButton, 200, "Exit") Control.BeginGroup = True Control = .Add(XtremeCommandBars.XTPControlType.xtpControlButton, 300, "Login") Control.BeginGroup = True End With wndAxDockingPane.SetCommandBars(wndAxCommandBars.GetDispatch) wndAxDockingPane.Options.HideClient = True Dim panA, panB As XtremeDockingPane.Pane panA = wndAxDockingPane.CreatePane(1, 220, 1200, XtremeDockingPane.DockingDirection.DockLeftOf, Nothing) ' panA.title = "This pane1" panB = wndAxDockingPane.CreatePane(2, 220, 1200, XtremeDockingPane.DockingDirection.DockBottomOf, panA) ' panB.title = "This pane1" End Sub Private Sub wndAxDockingPane_AttachPaneEvent(ByVal sender As System.Object, ByVal e As AxXtremeDockingPane._DDockingPaneEvents_AttachPaneEvent) Handles wndAxDockingPane.AttachPaneEvent Select Case e.item.Id Case 1 : e.item.Handle = RichTextBox1.Handle.ToInt32 Case 2 : e.item.Handle = RichTextBox2.Handle.ToInt32 End Select End Sub End Class step5: code in MDIParent1 is follows: Imports System.Windows.Forms Public Class MDIParent1 Private Sub ShowNewForm(ByVal sender As Object, ByVal e As EventArgs) Handles NewToolStripMenuItem.Click, NewToolStripButton.Click Dim ChildForm As New Form1 ChildForm.MdiParent = Me Static Dim m_ChildFormNumber As Integer m_ChildFormNumber += 1 ChildForm.Text = "Doc - " & m_ChildFormNumber ChildForm.Show() End Sub End Class step5: when startwith form1, every thing runs well, includes the commandbar and dockingpanel control step6: when start with MDIParent1 , it shows the form1 as a child form, when use the commandbar and dockingpanel control, error occurs: err1: with commandbar Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Dim Control, CtlProject As XtremeCommandBars.CommandBarControl CtlProject = wndAxCommandBars.ActiveMenuBar.Controls.Add(XtremeCommandBars.XTPControlType.xtpControlPopup, 100, "New", -1, False) ----->System.NullReferenceException:Objec reference not set to an instance of an object err2: with dockingpanel Dim Control, CtlProject As XtremeCommandBars.CommandBarControl 'CtlProject = wndAxCommandBars.ActiveMenuBar.Controls.Add(XtremeCommandBars.XTPControlType.xtpControlPopup, 100, "New", -1, False) 'With CtlProject.CommandBar.Controls ' Control = .Add(XtremeCommandBars.XTPControlType.xtpControlButton, 200, "Exit") ' Control.BeginGroup = True ' Control = .Add(XtremeCommandBars.XTPControlType.xtpControlButton, 300, "Login") ' Control.BeginGroup = True 'End With wndAxDockingPane.SetCommandBars(wndAxCommandBars.GetDispatch) wndAxDockingPane.Options.HideClient = True Dim panA, panB As XtremeDockingPane.Pane panA = wndAxDockingPane.CreatePane(1, 220, 1200, XtremeDockingPane.DockingDirection.DockLeftOf, Nothing) ' panA.title = "This pane1"----->System.NullReferenceException:Objec reference not set to an instance of an object ------------------------------------- Visual Studio 2005 8.0.50727.42 Visual Basic Project .net framework 2.0.50727 Codejock13.2.1 ActiveX