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.preview/src/org/eclipse/birt/report/designer/ui/preview/editors/ReportPreviewFormPage.java
return ID;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.IWorkbenchPart#createPartControl(org.eclipse.swt.widgets.Composite)
	 */
	public void createPartControl( Composite parent )
	{
		
		control = new Composite( parent, SWT.NONE );
		previewEditor.createPartControl( (Composite) control );
	}
	/* (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;
	}
	/* (non-Javadoc)
	 * @see org.eclipse.ui.part.EditorPart#doSave(org.eclipse.core.runtime.IProgressMonitor)
	 */