Using basic capabilities : Overview of using basic capabilities : Symbols and definitions : Modifying the look of a symbol
  
Modifying the look of a symbol
Learn about modifying the look of a symbol.
See
Format menu: Diagram format > Display Options
Display Mode command
Working with stylesheets
Imposing stylesheets on selected symbols
Adding color themes to diagrams
Symbol layering
Changing the gradient fill color for your symbols
Symbols and definitions