[Solved] frm.MdiParent = this; returns null for MdiParent...

[Ioannis Papasavvas]

Hi folks.

I use a RadRibbonForm as my main form (MDI container) and also a RadDock control to host my MDI child forms. My main form's Load event follows:

        private void MainForm_Load (object sender, EventArgs e)
        {
            if (this.IsMdiContainer != true)
                this.IsMdiContainer = true;

            string theme = ThemeResolutionService.ApplicationThemeName;
            ThemeResolutionService.ApplicationThemeName = "Office2007Silver";

            this.Text = Properties.Resources.AppName;

            this.dock.AutoDetectMdiChildren = true;
            this.dock.DocumentManager.DocumentInsertOrder = DockWindowInsertOrder.ToBack;
            this.MdiChildActivate += new EventHandler (MainForm_MdiChildActivate);

            FormPosition.LoadFromRegistry (this, Properties.Resources.AppName);
        }

The code that creates a new child form follows:

            EditorForm frm = new EditorForm (file);
            frm.MdiParent = this;
            RichTextBoxEx txt = frm.Editor;
            txt.CursorPositionChanged += new System.EventHandler (CursorPositionChanged);
            txt.SelectionChanged += new System.EventHandler (SelectionChanged);
            txt.MouseDown += new MouseEventHandler (OnRichTextBox_MouseDown);
            frm.Show ();

The problem is that after the line: "frm.MdiParent = this;" (this is the main form and is not null) frm.MdiParent becomes null !!!

Can you please help me?

Thank you in advance.

[Nikolay]

Hello Ioannis Papasavvas,

Thank you for the question.

RadDock detects when a form is up to become an MDI child and takes it from the original MDIParent. Then, this form is hosted in a RadDock window. When these actions take place, the MDI relation is broken and the form is not a real MDI child anymore, so the MDIParent property becomes null. This is an expected and desired behavior.

Kind regards,
Nikolay
the Telerik team

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