[OpenLayers-Users] Error in SelectFeaute

[Slawomir Messner]

Sry, worn topic before.
Hi,
I have a listener on "removelayer" (why there ist no "preremovelayer" 
like for addlayer). When a layer is removed then the following function 
is called:

deactivateDetails:function  () {
		if  (this.showDetailsSelect !=null) {
			this.showDetailsSelect.unselectAll();
			this.showDetailsSelect.deactivate();
			this.map.removeControl(this.showDetailsSelect);
			this.showDetailsSelect.destroy();
			this.showDetailsSelect =null;
		}
	},

After this function other listeners are called at last the listner of 
the handler in the showDetailsSelect control which is a 
SelectFeature-control. So the function moveLayerToTop is called and the 
"this.map is null"-exception is thrown. When I remove the destroy-method 
the exception isn't thrown. The question is "When you should call 
destroy? Or should I ever call destroy? Or is there an error in destory 
of SelectFeature?"
Last but not least the initialization of the SelectFeature:

if  (layerinstanceof  OpenLayers.Layer.Vector) {
			$this =this;
			var  selectOptions = {
				hover:true,
				toggle:true,
				highlightOnly:true,
				clickout:true,
				renderIntent:"temporary",
				onSelect:function  (f) { $this.showDetails(f); },
				onUnselect:function  (f) { $this.hideDetails(f); }
			};
			if  (this.showDetailsSelect) {
				this.deactivateDetails();
			}
			this.showDetailsSelect =new  OpenLayers.Control.SelectFeature(
						layer, selectOptions
					);
			this.showDetailsSelect.clickSelect =this.fixDetailsOnClick;
			this.showDetailsSelect.events.register("featurehighlighted",this,this.tooltipDetailsSelect);
			this.showDetailsSelect.events.register("featureunhighlighted",this,this.tooltipDetailsUnselect);
			this.map.addControl(this.showDetailsSelect);
			this.showDetailsSelect.activate();
		}


In advance thx for answers and comments.
Slawomir
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