Arduino TFT LCD Screen using Adafruit_GFX & Adafruit_ST7735 librar functions?

Hi all

On the Arduino Product page for the TFT display http://arduino.cc/en/Main/GTFT it is stated regarding the TFT library:
The library is backwards compatible, which means you can still use the Adafruit functions described here. https://learn.adafruit.com/downloads/pdf/adafruit-gfx-graphics-library.pdf
Could anybody share some code how this can be done?

I can see that the TFT library includes both the Adafruit_GFX and Adafruit_ST7735 libraries; I assume I do not need to declare / #include them. But running hte code for the graphic test or taking snips does not give any results

Using the code on the arduino page the displays works fine; however I miss some functionality part in the adafruit libraries like drawtriangle

Before adding some of my not working code I think it is preferable if somebody who has it up and running share his.

Thanks,