Ok I have been doing this sence I started playing the sims ok here it is
First pick the room you want the tree to be in. Then deleat one wall piece thing so that if it rains every one in that room holds either an umbrella or a newspaper over their head (in other words make an unfinished box). Then go into the build catolog. Next select a pine tree and place it in your room where you want it to be. Then once it has been placed fix your wall and enjoy the christmas cheer lol

OK to use the cheats you first have to be playing the game (story or freeplay) the you must enter the master code (L, R, D-Pad Up, A, Black)( By L and R I mean the triggers) if done correctly (it may take a few times) there should be a sort of shot pole thingy out the front of the house (make sure it's there or the other cheats wont work.) Once you have confirmed it's there you may enter any other cheat eg:

Unlock ALL of the Story Mode Locations:
B, White, D-Pad Left, B, D-Pad Up, B

Unlock ALL Clothes:
X, Black, D-Pad Down, D-Pad Right, X

Unlock ALL Objects:
White, B, D-Pad Down, D-Pad Left, D-Pad Up

Unlock ALL Recipes:
Black, X, D-Pad Up, D-Pad Down, D-Pad Right, A

Max ALL Motives:
D-Pad Up, B, D-Pad Up, D-Pad Right, White

Changes any Sim’s Skill:
Y, B, X, Black, D-Pad Left

Gives the Household §10,000:
R, L, Black, D-Pad Right, D-Pad Left

Go 6 Hours forward in Time:
B, X, L, D-Pad Up, D-Pad Down

Then once you have entered the cheat simply go to the weird pole thingy and click on it. It should say in the little box in the bottom right hand corner what cheats you may use, simply click on one.

NOTE: You must be playing the game to activate the cheats ie not in the pause menu or the main menu.

OKay I just noticed this and it's cool ok first buy a few "Frood trees" in the buy catalog under miscellaneous then place them near your dude then close the pause menu and harvest frome them they all have at least 1 of each fruit then when you have got all the fruit then sell them and buy more trees. Repeat this as many times as you please!!!!! =)

Unknown
While playing a game, press Left, Right, Down, Right, Left, Right, Down. If you entered the code correctly, you will hear a sim voice

Unknown
While playing a game, press Right, Up, Right, Down, Right, Up, Right, Down. If you entered the code correctly, you will hear a Sim voice.

Unknown
While playing a game, press Right, Down, Right, Down, Right, Down. If you entered the code correctly, you will hear a Sim voice.