Bug 175664 [Mac] Unexpected internal exception occurs when invoke expression builder
Description: There are two problems: 1. "fx" button (Click this button to invoke Expression Builder) could not be displayed correctly, nothing displayed in the button. 2. Click on the button, an unexpected internal exception occurs. Version:2.2.0.v20070205 Steps to reproduce: 1.Insert a Data item to the layout. Click "fx" button to invoke the expression builder, although on Mac "fx" button could not display correctly. Error log: Argument cannot be null Plug-in Provider: Eclipse.org Plug-in Name: BIRT Designer UI Plug-in ID: org.eclipse.birt.report.designer.ui Error Code: Error.GUIException.invokedByUnexpectedException Error Message:Argument cannot be null
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/util/UIUtil.java
public static boolean createGroup( DesignElementHandle parent )
	{
		Assert.isNotNull( parent );
		try
		{
			return addGroup( parent, -1 );
		}
		catch ( SemanticException e )
		{
			ExceptionHandler.handle( e );
			return false;
		}
	}
	/**
	 * Creates a new group in the position under the given parent
	 * 
	 * @param parent
	 *            The parent of the new group, it should be a table or a list
	 *            and should not be null.
	 * @param position
	 *            insert position
	 * @return true if the group created successfully, false if the creation is
	 *         cancelled or some error occurred.
	 */
	public static boolean createGroup( DesignElementHandle parent, int position )
	{
		Assert.isNotNull( parent );
		try
		{
			return addGroup( parent, position );