[Gambas-user] Transparent/non-destructive Picturebox?

[RalfGesellensetter]

Dear list,

I created a simple simulation: A character (displayed in a 32x32 picturebox) 
moves above a plane (I use a drawingarea), its track is plotted there.

Now I got two questions:
1. Despite using a GIF image with tranparent background, the drawing area is 
covered by a solid 32x32 square.

2. The picturebox (acting as sprite here) has the sad side effect of a rubber, 
erasing former tracks while hoovering over them :(

Any hints?

Thanks
Ralf