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/r21/widgets/R21PaneFolder.java
if (!putTrimOnTop) {
				viewFormTopCenterProxy.setTarget(topCenterCache);
				viewForm.setTopCenter(viewFormTopCenterProxy.getControl());
			}
		} else {
			if (!putTrimOnTop) {
				viewForm.setTopCenter(null);
			}
		}
	}
	
	/**
	 * Sets the top-right control (usually a dropdown), or null if none
	 * 
	 * @param topRight
	 */
	public void setTopRight(Control topRight) {
		topRightCache.setControl(topRight);
		if (topRight != null) {
			if (!putTrimOnTop) {
				viewFormTopRightProxy.setTarget(topRightCache);
				viewForm.setTopRight(viewFormTopRightProxy.getControl());
			}
		} else {
			if (!putTrimOnTop) {
				viewForm.setTopRight(null);
			}
		}
	}