ShowDialog() can loose focus when MDIContainer is present

This is happening in Ubuntu 10.04 + Mono 2.8

I have a MDIContainer. I open a form with the next code:

Form1 f = new Form1();
f.MdiParent = this;
f.Show();

The form has a TextBox and a Button. When I click the button, it shows a
dialog form:

DialogForm x = new DialogForm();
x.ShowDialog();

I can click the TextBox in the form behind the Dialog and the Dialog looses
the focus.

I'm trying to figure a way to avoid this.

Thanks for any help.
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