Designer not refreshing display

[Stuart Campbell]

Someone please help me before I tear my hair out!

I have a control derived from System.Web.UI.WebControls.Panel.
I have a designer derives from System.Web.UI.Design.WebControls.PanelDesigner.
I have added a designer verb... = new DesignerVerb("Maximize", new EventHandler(this.Maximize));

Problem:
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The Maximize verb works perfectly (just changes the height and width to 100%) but the actual panel doesn't resize.
If I switch to HTML view and then back to the designer - bingo it is resized.

Question:
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What do I need to call to make sure the designer updates as soon as the verb is executed?
Please - someone put me out of my misery.

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The code that is triggered by "Maximize".....
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public void Maximize(object sender, EventArgs e)
{
ContentContainer container = Component as ContentContainer;
container.Width = new Unit("100%");
container.Height = new Unit("100%");
}

TIA
Stuart