Problem with ChildBarFrameManager in MDI-Application

[Joerg Krause]

I've a problem with ChildBarFrameManager.

I'm using the windows manager class from the featured demo project. It works successfull in my application. Today I open the project and the programm isn't longer running (compiling ok).

During the MDI-child creation process the following run time error occurs:

System.ArgumentException: Cannot find a ChildFrameBarManager associated with the form type: Genesis.HtmlEditorForm
at Syncfusion.Windows.Forms.Tools.XPMenus.MainFrameBarManager.RegisterMdiChildTypes(Type[] formTypes)
at Syncfusion.Windows.Forms.Tools.XPMenus.MainFrameBarManager.MdiChildAdded(Object sender, ControlEventArgs e)
at System.Windows.Forms.ControlEventHandler.Invoke(Object sender, ControlEventArgs e)
at System.Windows.Forms.Control.OnControlAdded(ControlEventArgs e)
at System.Windows.Forms.ControlCollection.Add(Control value)
at System.Windows.Forms.ControlCollection.Add(Control value)
at System.Windows.Forms.Control.set_ParentInternal(Control value)
at System.Windows.Forms.Form.set_ParentInternal(Control value)
at System.Windows.Forms.Form.set_MdiParentInternal(Form value)
at System.Windows.Forms.Form.set_MdiParent(Form value)
at Genesis.WindowManager.AddDocument(HtmlEditorForm newForm) in d:\dokumente und einstellungen\joerg\eigene dateien\visual studio-projekte\worldsoftgenesisii\windowmanager.cs:line 211
at Genesis.WindowManager.AddDocumentFromFileName(String fileName) in d:\dokumente und einstellungen\joerg\eigene dateien\visual studio-projekte\worldsoftgenesisii\windowmanager.cs:line 204
at Genesis.WindowManager.OpenFile() in d:\dokumente und einstellungen\joerg\eigene dateien\visual studio-projekte\worldsoftgenesisii\windowmanager.cs:line 110
at Genesis.WindowManager.openBarItem_Click(Object sender, EventArgs e) in d:\dokumente und einstellungen\joerg\eigene dateien\visual studio-projekte\worldsoftgenesisii\windowmanager.cs:line 95
at Syncfusion.Windows.Forms.Tools.XPMenus.BarItem.OnItemClicked(EventArgs args)
at Syncfusion.Windows.Forms.Tools.XPMenus.BarItem.PerformClick()
at Syncfusion.Windows.Forms.Tools.XPMenus.BarRenderer.OnMouseUp(MouseEventArgs e)
at Syncfusion.Windows.Forms.Tools.XPMenus.BarControlInternal.OnMouseUp(MouseEventArgs e)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at Syncfusion.Windows.Forms.Tools.XPMenus.BarControlInternal.WndProc(Message& m)
at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

==
The step before the error are:

// create new child form (successful)
HtmlEditorForm childForm = new HtmlEditorForm(fileName);

// let the new form attach to the mdi parent
newForm.MdiParent = this.EditorMainForm;

This statement forces the error. I've tried to debug. childForm does contain a ChildBarFrameManager. The designer shows the bar items. There are some ActiveX controls in the form, but this part of the application works in the past days with and without childBarFrameManager.

==
Questions:
If the form has a childBarFrameManager, created with the designer and properly working in the past, what could happen here? How to debug the process of attaching a MDI child?

Thanks for any idea on this subject,

Joerg Krause
Berlin, Germany

[Joerg Krause]

Some additional informations: If I delete the previous used childFrameBarManager (loosing all associated Bars), the error disappears.
If a new childFrameBarManager was added from the toolbar, the error reoccurs. It doesn't matter if bars associated or not.

Joerg

[Ramesh Praveen]

Joerg,

This probably happens because your child form doesn't have a default constructor. Like we state in our User's Guide, all child forms (using the ChildFrameBarManager) should include a default constructor calling the InitializeComponent method (where the bar manager gets initialized).

This is necessary because our framework will want to create a dummy instance of each registered child form type.

So, provide a default constructor like this:

public HtmlEditorForm()
{
InitializeComponent();
}

and it should work fine.

Regards,
Praveen Ramesh

[Joerg Krause]

Thank you for the response. I've read about the constructor in the help files. So I had a constructor but without InitializeComponent() in it. What it really needs was the call to InitializeComponent(); which I have removed. Maybe the info is helpful for anybody.

>
> public HtmlEditorForm()
> {
> InitializeComponent();
> }
>
> and it should work fine.
>
> Regards,
> Praveen Ramesh
>

Joerg

[Administrator]

Thanks for the update.