Bug 200690 [Forms] Investigate resource sharing for section header gradients
From Andre: While doing some handle/memory leak tracking, we found that every section header allocates an image for the gradient. Since we use quite a few section headers in the work item editor, it would bring our handle count down if the images could be shared. In addition we would like to share the FormToolkit (since it allocates resources that can be shared too).
bundles/org.eclipse.ui.forms/src/org/eclipse/ui/forms/widgets/Section.java
*         not set by the client.
	 * @see #setDescriptionControl(org.eclipse.swt.widgets.Control)
	 */
	public Control getDescriptionControl() {
		return descriptionControl;
	}
	/**
	 * Sets the description control of this section. The control must not be
	 * <samp>null</samp> and must be a direct child of this container. If
	 * defined, contol will be placed below the title text and the separator and
	 * will be hidden int he collapsed state.
	 * <p>
	 * This method and <code>DESCRIPTION</code> style are mutually exclusive.
	 * Use the method only if you want to create the description control
	 * yourself.
	 * 
	 * @since 3.1
	 * @param descriptionControl
	 *            the control that will be placed below the title text.
	 */
	public void setDescriptionControl(Control descriptionControl) {
		Assert.isTrue((getExpansionStyle() & DESCRIPTION) == 0);
		Assert.isTrue(descriptionControl != null
				&& descriptionControl.getParent().equals(this));
		this.descriptionControl = descriptionControl;
	}
	/**
	 * Sets the color of the title bar border when TITLE_BAR style is used.
	 * 
	 * @param color