Bug 63159 [Progress] Progress dialog "Run in Background" button does not resize with larger font
If you set the dialog font to something large, the "Run in background" button does not correctly resize.
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/Dialog.java
*/
	protected int convertVerticalDLUsToPixels(int dlus) {
		
		if (fontMetrics == null)
			return 0;
		return convertVerticalDLUsToPixels(fontMetrics, dlus);
	}
	/**
	 * Returns the number of pixels corresponding to the width of the given
	 * number of characters.
	 * <p>
	 * This method may only be called after <code>initializeDialogUnits</code>
	 * has been called.
	 * </p>
	 * <p>
	 * Clients may call this framework method, but should not override it.
	 * </p>
	 * 
	 * @param chars
	 *            the number of characters
	 * @return the number of pixels
	 */
	protected int convertWidthInCharsToPixels(int chars) {
		
		if (fontMetrics == null)
			return 0;
		return convertWidthInCharsToPixels(fontMetrics, chars);
	}
	/**
	 * Creates a new button with the given id.