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draw primiitives with transparent colors?

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Hi! I'm using SlimDx (on top of Dx9), and I wonder how to use the alpha key in a Color to draw semi-transparent areas. For example, using the latest SlimDx release (Feburary 2010), there are a few samples included. If I run the "SimpleTriangle9" it will display a triangle with the colors red, green, blue. However, if I modify the alpha channel of each color, there is no change on screen, i.e. the three colors don't become less opaque. What's the simplest way to obtain transparency when drawing simple primitives using a VertexBuffer?

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