Changeing color of Button of ui element in webdynpro abap

Hi,

I have a requriment to change the color of button ui,one button will be blue color and other button will be red color,Each buttons will have different colors.

And one more requriment is i need to have tree ui element in context panel ui under view switch or header in context panel,when i click on view switch or on header of context panel then i should get tree.

Please provided valueable information.

Waiting for Reply.

Thanks & Regards.

Krishna.