Bug 119216 Regression: Group can't be added in layout editor.
Description: Group can't be added in layout editor. Steps to reproduce: 1. Add a table. 2. Right click on the table and find that "insert group" is grayed out.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/schematic/actions/InsertGroupActionFactory.java
{
		super( );
		this.selection = selection;
		setText( text );
	}
	public void setSelection( List selection )
	{
		this.selection = selection;
		this.currentModel = null;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.action.Action#isEnabled()
	 */
	public boolean isEnabled( )
	{
		return getTableEditPart( ) != null
				^ getListEditPart( ) != null
				&& ( (TableHandle) getTableEditPart( ).getModel( ) )
						.canContain( TableHandle.GROUP_SLOT,
								ReportDesignConstants.GROUP_ELEMENT );
	}
	/**
	 * Runs action.
	 * 
	 */
	public void run( )
	{
		if ( Policy.TRACING_ACTIONS )