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/src/org/eclipse/birt/report/designer/ui/editors/MultiPageReportEditor.java
Object adapter = getOutlinePage( );
			updateOutLineView( getActivePageInstance( ) );
			return adapter;
		}
		if ( type == DataViewPage.class )
		{
			Object adapter = getDataPage( );
			updateDateView( getActivePageInstance( ) );
			return adapter;
		}
		if ( getActivePageInstance( ) != null )
		{
			return getActivePageInstance( ).getAdapter( type );
		}
		return super.getAdapter( type );
	}
	private void updateDateView( IFormPage activePageInstance )
	{
		if ( dataPage == null )
		{
			return;
		}
		Object adapter = activePageInstance.getAdapter( DataViewPage.class );
		dataPage.setActivePage( (IPageBookViewPage) adapter );
	}
	private void updateOutLineView( IFormPage activePageInstance )
	{
		if ( outlinePage == null )
		{
			return;