Form not showing on Show(), because it's being used(?)

Question

I'm having trouble trying to remove a Form from this Dock Container once I used the dockContainer.Add(form) and later the dockContainer.Remove(dockableFormInfo) and when I make it show itself using form.Show(), it wont show up at all.

Looking trough the properties it shows that the form is actually visible = true, but even though the dockable control that uses the Form was removed from the Container, my thoughts are that it still used the Form resources and thus I am unable to make it appear outside the control.

How can I make the Form show up?

Answer 1

Problem solved, first thanks to Hans Passant for the TopLevel tip.

After removing from the docking container, just set TopLevel to true!

Here is the test code:

using System;
using System.Drawing;
using System.Windows.Forms;
using Crom.Controls.Docking;

namespace DockingTester
{
    public partial class Form1 : Form
    {
        private Form dummyForm;
        private readonly Guid dummyFormGuid = Guid.NewGuid();


        public Form1()
        {
            InitializeComponent();
            CreateDummyForm();
            this.dummyForm.Show();
        }

        private void CreateDummyForm()
        {
            dummyForm = new Form();
            this.dummyForm.Text = "Dummy docking test form";
        }

        private static void DockUndockForm(DockContainer dockContainer, Form form, Guid guid)
        {
            DockableFormInfo formInfo = dockContainer.GetFormInfo(guid);

            //Add
            if (formInfo == null)
            {
                formInfo = dockContainer.Add(form, zAllowedDock.All, guid);
                dockContainer.DockForm(formInfo, DockStyle.Left, zDockMode.Inner);
            }
            //Remove
            else
            {
                Form dummy =  formInfo.DockableForm;
                dockContainer.Undock(formInfo, new Rectangle(Point.Empty, new Size(100, 300)));
                dockContainer.Remove(formInfo);

                dummy.FormBorderStyle = System.Windows.Forms.FormBorderStyle.Sizable;
                dummy.TopLevel = true;
            }
        }

        private void dockUndockButton_Click(object sender, EventArgs e)
        {
            if (this.dummyForm.IsDisposed)
                CreateDummyForm();
            DockUndockForm(this.dockContainer1, this.dummyForm, this.dummyFormGuid);
        }

    }
}