Bug 63420 [R21PRES] Flash on tab switch
bundles/org.eclipse.ui.presentations.r21/src/org/eclipse/ui/internal/presentations/R21BasicStackPresentation.java
bgPercents = R21Colors.getActiveViewGradientPercents();
			} else {
				fgColor = R21Colors
						.getSystemColor(SWT.COLOR_TITLE_INACTIVE_FOREGROUND);
				bgColors = R21Colors.getDeactivatedViewGradient();
				bgPercents = R21Colors.getDeactivatedViewGradientPercents();
			}
		} else {
			fgColor = R21Colors.getSystemColor(SWT.COLOR_LIST_FOREGROUND);
			bgColors = null;
			bgPercents = null;
		}
		drawGradient(fgColor, bgColors, bgPercents, vertical);
		
		
		
		
		
		
		
		
		
		        	
		
		
		
		
		
		 }