To create a button one first has to insert a new symbol (menu - insert - new symbol - button).
Four conditions appear on the time line:
-normal (condition how the button appears without interaction)
-above (condition how the button is affected with the mouse)
-pressed (when pressed with the pointer of the mouse)
-asset (here the range is marked, which reacts to the pointer of the mouse).
We draw a circle on the stage in the condition "normal". Afterwards we add a key picture
in the time line in the condition "above".
The colour of the circle on the stage is changed then.
Another key picture is inserted in the time line of condition "pressed" and "asset".
Then the area, which should react on the pointer of the mouse, is marked in the condition "asset".