deactivate on clear. r=bartvde (closes #2471)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@10114 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Control/NavigationHistory.js

@@ -129,8 +129,6 @@ OpenLayers.Control.NavigationHistory = OpenLayers.Class(OpenLayers.Control, {
             "moveend": this.getState
         }, this.registry);
         
-        this.clear();
-
         var previousOptions = {
             trigger: OpenLayers.Function.bind(this.previousTrigger, this),
             displayClass: this.displayClass + " " + this.displayClass + "Previous"
@@ -145,6 +143,7 @@ OpenLayers.Control.NavigationHistory = OpenLayers.Class(OpenLayers.Control, {
         OpenLayers.Util.extend(nextOptions, this.nextOptions);
         this.next = new OpenLayers.Control.Button(nextOptions);
 
+        this.clear();
     },
     
     /**
@@ -280,7 +279,9 @@ OpenLayers.Control.NavigationHistory = OpenLayers.Class(OpenLayers.Control, {
      */
     clear: function() {
         this.previousStack = [];
+        this.previous.deactivate();
         this.nextStack = [];
+        this.next.deactivate();
     },
 
     /**