CorelDRAW X6 :: Adding Different Colored Duplicate Layers On Top To Make It Multicolored

I was watching one of the tutorials by Scott Georgeson on lynda.com on Corel X6.  It was on the polygon tool where he was  making a polygon and adding different colored duplicate layers on top to make it multicolored.  He said to hold the plus+ key and then grab handle to shrink one of the layers down to show some of the underlying layer.  When I try this the layers aren't isolated and the whole thing moves.  I saw a check box in the settings to edit layers separately but didn't work.