Hi Hung
The Event marker allows you to run scripts, when the scene is shown and when it is hidden. The scripts are based on the XPression SDK. You can find all the available commands in the XPressionSDK.chm help file. Which you can find on your XPression unit at: C:Program Files (x86)XPressionStudioHelp
The scripting in XPression is extremely powerful and can be used for a variety of things.
I have for example created automated bar-charts, crawls that removes it background strap with an animation, objects that moves relative to each other etc.
Best regards
Niels
#XPression