Set parent form of UITypeEditor

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C#2.0

C#

time

I've implemented a custom UITypeEditor. The UITypeEditor is a modal dialog and should open as a child dialog of my application.
I've overriden the method EditValue, so i can show the dialog. The WindowsFormsEditorService handles the display of the dialog while in design time:

public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
{
    if (context != null && context.Instance != null && provider != null)
    {
        this.context = context;
        edSvc = (IWindowsFormsEditorService)provider.
                 GetService(typeof(IWindowsFormsEditorService));
        if (edSvc != null)
        {
            CollectionEditorForm editorFrm = new 
                                CollectionEditorForm(newCollection);
            edSvc.ShowDialog(editorFrm);
        }
    }
}

I've tried to set the Owner-property of the editor form, but hadn't any success yet.
How can i set the owner of my editor form?

Thanks in advance