Avoid panel being displayed after deactivate. p=jorix, r=me (closes #2835)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@10732 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Control/Panel.js

@@ -95,6 +95,7 @@ OpenLayers.Control.Panel = OpenLayers.Class(OpenLayers.Control, {
      * APIMethod: destroy
      */
     destroy: function() {
+        this.deactivate();
         OpenLayers.Control.prototype.destroy.apply(this, arguments);
         for(var i = this.controls.length - 1 ; i >= 0; i--) {
             if(this.controls[i].events) {
@@ -143,6 +144,7 @@ OpenLayers.Control.Panel = OpenLayers.Class(OpenLayers.Control, {
                 control = this.controls[i];
                 this.activeState[control.id] = control.deactivate();
             }    
+            this.redraw();
             return true;
         } else {
             return false;