diff --git a/albow/tab_panel.py b/albow/tab_panel.py
index 935e926..83616b6 100644
--- a/albow/tab_panel.py
+++ b/albow/tab_panel.py
@@ -157,7 +157,7 @@ class TabPanel(Widget):
         i = (x - m) * n // width
         if 0 <= i < n:
             return i
-        
+
     def gl_draw_self(self, root, offset):
         self.gl_draw(root, offset)
 
@@ -166,7 +166,7 @@ class TabPanel(Widget):
 
         if len(pages) > 1:
             tlcorner = (offset[0] + self.bottomleft[0], offset[1] + self.bottomleft[1])
-            pageTabContents = []        
+            pageTabContents = []
             current_page = self.current_page
             n = len(pages)
             b = self.tab_border_width
@@ -182,7 +182,7 @@ class TabPanel(Widget):
             surface = Surface(self.size, SRCALPHA)
 
             glEnable(GL_BLEND)
-            
+
             for i, page in enumerate(pages):
                 x1 = x0+tabWidth
                 selected = page is current_page
@@ -197,8 +197,8 @@ class TabPanel(Widget):
                 offs = ((tabWidth - r.size[0])/2) + m +((s+tabWidth)*i)
 
                 surface.blit(buf, (offs, m))
-                x0 = x1 + s    
-            
+                x0 = x1 + s
+
             data = image.tostring(surface, 'RGBA', 1)
             rect = self.rect.move(offset)
             w, h = root.size
@@ -214,6 +214,5 @@ class TabPanel(Widget):
             glDrawPixels(self.width, self.height,
                 GL_RGBA, GL_UNSIGNED_BYTE, fromstring(data, dtype='uint8'))
             glPopAttrib()
-            glFlush()
 
             glDisable(GL_BLEND)
diff --git a/albow/widget.py b/albow/widget.py
index c147b17..81648dd 100644
--- a/albow/widget.py
+++ b/albow/widget.py
@@ -750,7 +750,6 @@ class Widget(object):
             GL.glDrawPixels(self.width, self.height,
                 GL.GL_RGBA, GL.GL_UNSIGNED_BYTE, fromstring(data, dtype='uint8'))
             GL.glPopAttrib()
-            GL.glFlush()
 
     def gl_draw_self(self, root, offset):
         pass