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
}
		boolean visitParameterGroup( ParameterGroupHandle group, Object value )
		{
			return false;
		}
		boolean visitScalarParameter( ScalarParameterHandle param, Object value )
		{
			return false;
		}
		boolean visit( ReportDesignHandle report )
		{
			return visit( report, null );
		}
		boolean visit( ReportDesignHandle report, Object value )
		{
			SlotHandle parameters = report.getParameters( );
			Iterator iter = parameters.iterator( );
			while ( iter.hasNext( ) )
			{
				Object param = iter.next( );
				if ( param instanceof CascadingParameterGroupHandle )
				{
					if ( !visitCascadingParamterGroup(
							(CascadingParameterGroupHandle) param, value ) )
					{
						return false;
					}
				}
				else if ( param instanceof ParameterGroupHandle )
				{