The Change Transparency action allows you to change the transparency of any graphical object. This action has the same effect as the Fade animation action but does not require any time to be entered. The transparency change will occur immediately.
Add the Change Transparency action to your trigger, as described in adding actions. The Change Transparency tab will automatically appear when you add the action.
Click on the name of the object in the object list that you want to use with this action. Only one object can be selected from the list.
Click on the Apply button to save your changes.
Introducing the Attribute Actions
the Change Polygon Fill Colour action