gridObj in PHP MapScript

[CamKhmer]

I am trying to build a grid layer for my map but I can't get it to display if
I generate the layer in MapScript instead of the mapfile. Here is the method
I am using to construct the layer, can anyone see where I'm going wrong?
With this code the map is rendered just without the grid and isVisible()
returns 0. Also the layer is not included in getlayersdrawingorder() which
makes me think I need to do something else make draw() recognize this new
layer?

	private function buildMapGrid(){
		$gridLayer = ms_newLayerObj($this->mapObj);
		$gridLayer->connectiontype = MS_GRATICULE;
		$gridLayer->name = "Grid";
		$gridLayer->type = MS_LAYER_LINE;
		$gridLayer->status = MS_ON;
		$gridLayer->projection = "proj=utm,GRS80=WGS84,datum=WGS84";
		
			$gridClass = ms_newClassObj($gridLayer);
			$gridClass->label->font = "sans";
			$gridClass->label->type = MS_TRUETYPE;
			$gridClass->label->size = "8";
			$gridClass->label->color->setRGB("0","0","0");
			$gridClass->label->outlinecolor->setRGB("255","255","255");
			
		$gridLayer->grid->labelformat = "DD";
		$gridLayer->grid->minarcs = "4";
		$gridLayer->grid->maxarcs = "6";

		print $gridLayer->isVisible();
	}

Any advice would be much appreciated.
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