Hiding a 'Category' in the Properties Window

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I know several ways to hide individual properties, and in something I'm working on I do it using a Designer, more specifically by overriding the PreFilterProperties method

<br />		protected override void PreFilterProperties(System.Collections.IDictionary properties)<br />		{<br />			properties.Remove("Dock");<br />			properties.Remove("TabStop");<br />			properties.Remove("TabIndex");<br />			properties.Remove("Visible");<br />			properties.Remove("Enabled");<br />			properties.Remove("Locked");  <===========================================================<br />			properties.Remove("Anchor");<br />			properties.Remove("Name");  <===========================================================<br />			properties.Remove("AutoSize");<br />			properties.Remove("AutoSizeMode");<br />			properties.Remove("Location");<br />			properties.Remove("Size");<br />			properties.Remove("MaximumSize");<br />			properties.Remove("MinimumSize");<br />			properties.Remove("BorderStyle");<br />			properties.Remove("GenerateMember");<br />			properties.Remove("Modifiers");<br />			properties.Remove("Design");<br /><br />			base.PreFilterProperties(properties);<br />		}<br />

The two properties marked still show up however. [confused]

They are both in the 'Design' Category, so even if the code above worked, I would still be left with an empty Category. So

1) anybody got any ideas about why the two properties remain and/or how to get rid of them.
2) any ideas on how to remove the 'Design' Category. If you look at either of the Panels in a SplitContainer, they don't have a Design Category, so presumably it is possible.