Bug 130068 [Regression]Report Parameter window doesn't pop up when preview a report with parameter.
Description: Report Parameter window doesn't pop up when preview a report with parameter. Steps to reproduce: 1. New a report parameter without default value. 2. Drag it to Layout. 3. Click Preview in Layout. Expected result: Window pops up for value input. Actual result: Some required parameter values are not set or set to incompatible data type.
UI/org.eclipse.birt.report.designer.ui.preview/src/org/eclipse/birt/report/designer/ui/preview/editors/ReportPreviewFormPage.java
*/
	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#isDirty()
	 */
	public boolean isDirty( )
	{
		return false;
	}
	
	protected IReportProvider getProvider( )
	{
		IReportProvider provider =  (IReportProvider) editor.getAdapter( IReportProvider.class );
		
		if(provider == null)
		{
			provider = super.getProvider( );
		}
		
		return provider;