Bug 63420 [R21PRES] Flash on tab switch
bundles/org.eclipse.ui.presentations.r21/src/org/eclipse/ui/internal/presentations/R21BasicStackPresentation.java
* @param bgColors
	 * @param percentages
	 * @param vertical
	 */
	public void drawGradient(Color fgColor, Color[] bgColors,
			int[] percentages, boolean vertical) {
		
		
		if (titleLabel == null || viewToolBar == null)
			return;
		titleLabel.setBackground(bgColors, percentages, vertical);
		titleLabel.setForeground(fgColor);
		titleLabel.update();
	}
	public boolean isActive() {
		return activeState;
	}
	/**
	 * Set the size of a page in the folder.
	 * 
	 * TODO: Kim here...I had to make this public so that the when the font was
	 * updated via the color scheme service it could relayout the
	 * presentation... calling control.getLayout() doesn't do the trick.
	 */
	public void setControlSize() {
		
		
		if (current != null) {
			paneFolder.setTopLeft(titleLabel);
			titleLabel.setText(current.getTitle());