Bug 179743 Parameter Validate Event is not Called
I have tested the validate event on parameters and it never appears to get called.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/EngineTask.java
{
					Object value = convertToType( param.getDefaultValue( ),
							param.getDataType( ) );
					executionContext.setParameterValue( name, value );
					runValues.put( name, value );
				}
				return true;
			}
			boolean visitParameterGroup( ParameterGroupHandle group,
					Object value )
			{
				return visitParametersInGroup( group, value );
			}
		}.visit( (ReportDesignHandle) runnable.getDesignHandle( ) );
	}
	public void close( )
	{
		executionContext.close( );
	}
	protected IReportLayoutEngine createReportLayoutEngine( String pagination,
			IRenderOption options )
	{
		IReportLayoutEngine layoutEngine = LayoutEngineFactory
				.createLayoutEngine( pagination );
		if ( options != null )
		{
			Object fitToPage = renderOptions
					.getOption( IPDFRenderOption.FIT_TO_PAGE );
			if ( fitToPage != null )
			{