in the pannel for header where ur title is u apply the titleBackgroundSkin to do that.
there is also an property for headerStyleName u can change the color and size of the title. but in this case u
want different font size title but through style u can only one font size for all.
Fo this u take html tag that contain the title text and mix with html tag. his will solve ur problem
if u get get sucess then give me mark
Then how i can asign the htmltext to the title of the panel.