As always, we will be using Pixels as our units of measure. Right click on the screen and select Page Options... from the pop up menu. In the Units tabbed section, select Pixels for the Units and 0-255 for the Color Units. In the Grid and Ruler tabbed section set the Major Spacing to 100pix (key it in exactly like this please) and the Number of Subdivisions to 10. Press OK to close the dialog and apply the changes.

NOTE: You will notice from time to time I apply arbitrary colors to objects. I do this to make the objects easier to see. If I do not specify a fill for an object, you do not have to apply a fill or outline color.

When I show an ellipse or rectangle that has just been created, that has no fill, it is because I have set the fill to none before I exported the illustration. By default, all ellipses, rectangles and Quick Shapes have a black outline and a black fill. There is nothing wrong with your copy of Xara.

Using the Rectangle Tool, draw two rectangles to the sizes shown.

TIP: To draw a rectangle to an exact size, look at the dimensions on the Infobar as you draw. Then before you deselect the rectangle, but after you have released the mouse button, change the Width and Height settings on the Infobar. Press Enter on your keyboard to apply the changes.