A rectangular overlay that can be assigned a texture.

Initialize	Initializes the overlay with a position of (0, 0), a width of 100 pixels, and a height of 50 pixels.
InitializeWithPositionSize	Initializes the overlay with the specified position and size.
InitializeWithPositionTexture	Initializes the overlay with a specified background texture. The size of the overlay will be the same as the size of the texture.
InitializeWithXYTexture	Initializes the overlay with a specified background texture. The size of the overlay will be the same as the size of the texture.
InitializeWithXYWidthHeight	Initializes the overlay with the specified x position, y position, width, and height, all specified in pixels.