diff --git a/release/antos-1.1.2.tar.gz b/release/antos-1.1.2.tar.gz
index 1dbb5f9..6cb78aa 100644
Binary files a/release/antos-1.1.2.tar.gz and b/release/antos-1.1.2.tar.gz differ
diff --git a/src/core/tags/TabContainerTag.ts b/src/core/tags/TabContainerTag.ts
index 5abc707..fdc33d4 100644
--- a/src/core/tags/TabContainerTag.ts
+++ b/src/core/tags/TabContainerTag.ts
@@ -88,6 +88,28 @@ namespace OS {
                     this._ontabselect = f;
                 }
 
+
+                /**
+                 * Get all tab items in the container
+                 *
+                 * @readonly
+                 * @type {TabContainerTabType[]}
+                 * @memberof TabContainerTag
+                 */
+                get tabs(): TabContainerTabType[]
+                {
+                    return (this.refs.bar as TabBarTag).items as TabContainerTabType[];
+                }
+
+                /**
+                 * Select a tab by its index
+                 *
+                 * @memberof TabContainerTag
+                 */
+                set selectedIndex(i: number) {
+                    (this.refs.bar as TabBarTag).selected = i;
+                }
+
                 /**
                  * Setter:
                  * 
@@ -135,6 +157,7 @@ namespace OS {
                     }
                     $(v.container).show();
                     this.observable.trigger("resize", undefined);
+                    $(v.container).attr("tabindex",-1).css("outline", "none").trigger("focus");
                 }
                 get selectedTab(): TabContainerTabType {
                     return this._selectedTab;
@@ -182,9 +205,10 @@ namespace OS {
                  *
                  * @param {GenericObject<any>} item tab descriptor
                  * @param {boolean} insert insert the tab content to the container ?
+                 * @returns {ListViewItemTag} the tab DOM element
                  * @memberof TabContainerTag
                  */
-                public addTab(item: GenericObject<any>, insert: boolean): void {
+                public addTab(item: GenericObject<any>, insert: boolean): ListViewItemTag {
                     if (insert) {
                         $(this.refs.yield).append(item.container);
                     }
@@ -196,6 +220,7 @@ namespace OS {
                         item
                     );
                     el.selected = true;
+                    return el;
                 }
 
                 /**
@@ -210,6 +235,7 @@ namespace OS {
                     }
                     (this.refs.bar as TabBarTag).delete(tab);
                 }
+
                 /**
                  * Mount the tag and bind basic events
                  *
diff --git a/src/core/vfs.ts b/src/core/vfs.ts
index c7da6f4..2aab59a 100644
--- a/src/core/vfs.ts
+++ b/src/core/vfs.ts
@@ -1596,6 +1596,11 @@ namespace OS {
                  * @memberof URLFileHandle
                  */
                 protected _rd(t: string): Promise<any> {
+                    //read the file
+                    if (t === "binary") {
+                        //return API.handle.fileblob(this.path);
+                        return API.blob(this.path+ "?_=" + new Date().getTime());
+                    }
                     return API.get(this.path, t ? t : "text");
                 }
             }
diff --git a/src/packages/CodePad/BaseExtension.ts b/src/packages/CodePad/BaseExtension.ts
index c706221..0cc52a0 100644
--- a/src/packages/CodePad/BaseExtension.ts
+++ b/src/packages/CodePad/BaseExtension.ts
@@ -85,7 +85,11 @@ namespace OS {
         protected logger() {
             if(!this.app.setting.showBottomBar)
             {
-                this.app.showBottomBar(true);
+                this.app.showOutput(true);
+            }
+            else
+            {
+                this.app.showOutput(false);
             }
             return this.app.logger;
         }
diff --git a/src/packages/CodePad/ExtensionMaker.ts b/src/packages/CodePad/ExtensionMaker.ts
index cacbbd1..af1b4d2 100644
--- a/src/packages/CodePad/ExtensionMaker.ts
+++ b/src/packages/CodePad/ExtensionMaker.ts
@@ -86,6 +86,31 @@ namespace OS {
                 .catch((e) => this.logger().error(__("Unable to read meta-data: {0}", e.stack)));
         }
 
+        /**
+         *
+         *
+         * @memberof ExtensionMaker
+         */
+        installFromURL(): void
+        {
+            this.logger().clear();
+            this.app
+                .openDialog("PromptDialog", {
+                    title: __("Enter URI"),
+                    label: __("Please enter extension URI:")
+                })
+                .then(async (v) => {
+                    if(!v) return;
+                    try {
+                        await this.installZip(v);
+                        this.logger().info(__("Extension installed"));
+                        return this.app.loadExtensionMetaData();
+                    } catch (e) {
+                        return this.app.error(__("Unable to install extension: {0}", v));
+                    }
+
+                });
+        }
         /**
          *
          *
@@ -295,6 +320,10 @@ namespace OS {
                     if (this.app.extensions[meta.meta.name]) {
                         this.app.extensions[meta.meta.name].text = meta.meta.text;
                         this.app.extensions[meta.meta.name].nodes = [];
+                        if(this.app.extensions[meta.meta.name].ext && this.app.extensions[meta.meta.name].ext.cleanup)
+                        {
+                            this.app.extensions[meta.meta.name].ext.cleanup();
+                        }
                         this.app.extensions[meta.meta.name].ext =  new App.extensions[meta.meta.name](this.app); 
                         for (v of meta.meta.actions) {
                             this.app.extensions[meta.meta.name].addAction(v);
diff --git a/src/packages/CodePad/extensions.json b/src/packages/CodePad/extensions.json
index 8cb06f2..31ef6b1 100644
--- a/src/packages/CodePad/extensions.json
+++ b/src/packages/CodePad/extensions.json
@@ -40,8 +40,12 @@
                 "name": "release"
             },
             {
-                "text": "__(Install extension)",
+                "text": "__(Install extension from file)",
                 "name": "install"
+            },
+            {
+                "text": "__(Install extension from URL)",
+                "name": "installFromURL"
             }
         ]
     }
diff --git a/src/packages/CodePad/main.ts b/src/packages/CodePad/main.ts
index 0c0f5a7..8bfff08 100644
--- a/src/packages/CodePad/main.ts
+++ b/src/packages/CodePad/main.ts
@@ -448,6 +448,11 @@ namespace OS {
                 this.trigger("resize");
             }
 
+            showOutput(toggle:boolean = false): void {
+                if(toggle)
+                    this.showBottomBar(true);
+                this.bottombar.selectedIndex = 0;
+            }
 
             /**
              * Apply [[showBottomBar]] from user setting value
@@ -936,6 +941,14 @@ namespace OS {
                 let v: GenericObject<any>;
                 const dirties = this.eum.dirties();
                 if (dirties.length === 0) {
+                    // cleanup all extension
+                    for(let k in this.extensions)
+                    {
+                        if(this.extensions[k].ext && this.extensions[k].ext.cleanup)
+                        {
+                            this.extensions[k].ext.cleanup();
+                        }
+                    }
                     return;
                 }
                 evt.preventDefault();
diff --git a/src/packages/CodePad/templates/ext-main.tpl b/src/packages/CodePad/templates/ext-main.tpl
index 26cbf8b..043e351 100644
--- a/src/packages/CodePad/templates/ext-main.tpl
+++ b/src/packages/CodePad/templates/ext-main.tpl
@@ -7,4 +7,7 @@ class App.extensions.{0} extends App.BaseExtension
         super app
 
     test: () ->
-        @notify "Test action is invoked"
\ No newline at end of file
+        @notify "Test action is invoked"
+    
+    cleanup: () ->
+        # clean up the extension on application exit
\ No newline at end of file