Bug 65444 [R21PRES] Close button shown when views not closeable
RC1 build - run the browser example using the R2.1 presentation - the views have close buttons in the titlebar, but should not because the perspective has fixed="true" (meaning that all initial views are non-moveable and non-closeable)
bundles/org.eclipse.ui.presentations.r21/src/org/eclipse/ui/internal/presentations/R21BasicStackPresentation.java
/**
	 * Update the tab folder's colours to match the current theme settings
	 * and active state
	 */
	protected void updateGradient() {
        Color fgColor;
        Color[] bgColors;
        int[] bgPercents;
        boolean vertical = false;
        if (isActive()) {
            if (getShellActivated()) {
                fgColor = R21Colors.getSystemColor(SWT.COLOR_TITLE_FOREGROUND);
                bgColors = R21Colors.getActiveViewGradient();
                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);