HTML doesnt work in FLASH MX 04

Hi!
I have the following html code in a dynamic textfield in flash but it doesnt show anything (like there is no text), how come?


<TEXTFORMAT LEADING="2"><P ALIGN="LEFT"><FONT FACE="_sans" SIZE="11" COLOR="#000000"><B>tjocka boksträver</B></FONT></P></TEXTFORMAT><TEXTFORMAT LEADING="2"><P ALIGN="RIGHT"><FONT FACE="_sans" SIZE="21" COLOR="#003399"><B>högershiftade!</B></FONT></P></TEXTFORMAT><TEXTFORMAT LEADING="2"><P ALIGN="CENTER"><FONT FACE="_sans" SIZE="16" COLOR="#339933"><B><U>understruket</U></B></FONT></P></TEXTFORMAT>

/Thanx for answering, Ayaz