Non-Character or npc text box

[Kingdom Ablaze]

Non-Character or npc text box:
RMVX:
Detailed Description:
KK, so basicly what i want is to have a in game window in the bottom left corrner of the map(see below picture) where i can call a method(from the event editor) some thing like: addText("You opened the door") and it adds it to the bottom of the window, every thing stays untill some thing has been added under it. then everything is moved up, if something touches the top of the window then it is deleated. let me know if u need me to exsplain more.
Screen shots:

 

[Kingdom Ablaze]

i know how to make the window, but im not so sure i know how to do the rest, anyone wanna at least give me an idea how to move the text around once i got it in the box?