[Mono-winforms-list] child form sometimes does not appear on ShowDialog (about 30%)

[tsai]

openSUSE 11.1,  (mono -V svn version 2.5 r132544 2009/04/24)attached file Bug_ShowDialog.rar is vs2005 solution source file1.open openSUSE -> GNOME Terminal
2.cd /home/test/Desktop
3.mono Bug_ShowDialog.exe
4.click ChildForm button (sometimes ChildForm does not appear, program CRASH)
5.click ChildForm close button
1. parent form inherit from Form
        private void button1_Click(object sender, EventArgs e)
        {
            ChildFm form = new ChildFm();
            form.Owner = this;
            form.Text = form.ClientSize.Width + ":" + form.ClientSize.Height +
                form.StartPosition.ToString() +
                form.Location.X + ":" + form.Location.Y +
                form.ShowInTaskbar + ":" + form.TopMost;
            form.ShowDialog();     // sometimes program CRASH
            form.Dispose();
            form = null;
        }

2. bgForm inherit from Form
      public bgForm()
      {
          InitializeComponent();
          this.StartPosition = System.Windows.Forms.FormStartPosition.Manual;
      }

3. child form inherit from bgForm
      public ChildFm()
      {
          InitializeComponent();

          this.ControlBox = false;
          this.FormBorderStyle = FormBorderStyle.None;
          this.Location = new Point(200, 200);
          this.StartPosition = System.Windows.Forms.FormStartPosition.Manual;
      }
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