Help needed in adding effects of certain HTML tags in Flex spark Richtext

I want to apply the effects of the following HTML tags/ attributes, in my HTML text rendered in Flex Spark Richtext Component.
Superscript - <sup>
Subscript - <sub>
Blockquotes - <blockquotes>
Ordered Lists - <ol><li>
Unordered List - <ul><li>
Horizontal Rule - <hr>
Direction Attribute for <p> - <p dir="rtl">Hello</p>
Background Color for <font>
I have observed that the above tags have no effect in RichText. Is this a limitation?
Any solutions, tweaks and tricks will be appreciated...
Thanks,
Mangirish

check this out . this should be able to answer you question.
http://livedocs.adobe.com/flex/3/html/help.html?content=textcontrols_04.html
Miguel

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