Gtk textview issue with scrollbar

["Wang, Pengzhuo" <Pengzhuo Wang windriver com>]

Hi all,
  I'm running gtk-demo (gtk2.14.7+DirectFB 1.3), and found sometimes
textview backgound color turn into black color,instead of orginial white
color when scrolling bar. 
So I can see the text content of textview except for clicking the area
of textview.
 Can anybody help me out? Thank you in advance.

Best Regards
 
pengzhuo wang(bobwang)
Professional Service | WindRiver P.R.China
Room3-H,New JinQiao Plaza, 
No.585 Xizhang Rd(M),Shanghai,200003,P.R.C
Tel:86-21-63585586/87/89/90 ext.208 Fax:86-21-63585591