How to effectively create this kind of control

The shape of the control always will be a rectangle.

The user must be able to click on it (like a button).

What is different about this control it's the way it is rendered. For example, the control could be any of this images:

I will have to dynamically create this control. In order to construct the layout of the control (which it can differ), it will have a property like this:

public IEnumerable<RectangleInfo> Rectangles{get;set;}

public class RectangleInfo
{
public int X{get;set;}
public int Y{get;set;}
public int Height{get;set;}
public int Width{get;set;}
}

So, any ideas of how to begin constructing this control?

Which class it should inherit from? Control? ContentControl?

I thought each rectangle definition could be a Label (nasty) and then I set the x,y,widht,height of each Label (didn't like that idea)

OBS: It is trickier than it looks, for example, if the user resize the window, this control should resize too (each rectangle should resize accordingly)

Take a look at WPF FlashMessage
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