Bug 130495 Get rid of SessionHandleAdapter
Now, we use SessionHandleAdapter to keep current active report deisng. That's a bad practive for editor swith and rebuild will cuase lots of problmes. Need find way to replace it.
UI/org.eclipse.birt.report.designer.ui.editors.schematic/src/org/eclipse/birt/report/designer/ui/editors/pages/ReportLayoutEditorFormPage.java
* (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.designer.ui.editors.schematic.layout.AbstractReportGraphicalEditorWithRuler#dispose()
	 */
	public void dispose( )
	{
		if ( getCommandStack( ) != null )
		{
			WrapperCommandStack stack = (WrapperCommandStack) getCommandStack( );
			stack.removeCommandStackListener( getCommandStackListener( ) );
		}
		super.dispose( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.designer.ui.editors.IReportEditorPage#markPageStale(int)
	 */
	public void markPageStale( int type )
	{
		staleType = type;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.designer.ui.editors.IReportEditorPage#getStaleType()
	 */
	public int getStaleType( )
	{
		return staleType;