diff --git a/lib/msoffice.js b/lib/msoffice.js
index 32fd718..d33ff33 100644
--- a/lib/msoffice.js
+++ b/lib/msoffice.js
@@ -72,6 +72,10 @@ function Excel() {
         } else {
             this.currentWorksheet = this.currentWorkbook.Worksheets(idx);
         }
+        
+        // switch to the worksheet
+        this.currentWorksheet.Activate();
+        
         return this;
     };
 
@@ -119,7 +123,7 @@ function PowerPoint() {
 
     console.info("Microsoft Office PowerPoint", this.version);
 
-	this.currentPresentation = null;
+    this.currentPresentation = null;
 
     this.open = function(filename) {
         if (typeof filename !== "undefined") {
@@ -129,16 +133,16 @@ function PowerPoint() {
             }
             if (FILE.fileExists(filename)) {
                 console.info("FOUND", filename);
-				this.application.Presentations.Open(filename);
-				this.currentPresentation = this.application.ActivePresentation;
+                this.application.Presentations.Open(filename);
+                this.currentPresentation = this.application.ActivePresentation;
             } else {
                 console.warn("NOT FOUND", filename);
-				this.currentPresentation = this.application.Presentations.Add(true);
+                this.currentPresentation = this.application.Presentations.Add(true);
             }
         } else {
             this.currentPresentation = this.application.Presentations.Add(true);
         }
-		//this.selectPresentation(1);
+        //this.selectPresentation(1);
     };
 
     this.selectPresentation = function(idx) {
@@ -223,7 +227,7 @@ exports.Excel = Excel;
 exports.PowerPoint = PowerPoint;
 exports.Word = Word;
 
-exports.VERSIONINFO = "Microsoft Office interface (msoffice.js) version 0.2.0";
+exports.VERSIONINFO = "Microsoft Office interface (msoffice.js) version 0.2.1";
 exports.AUTHOR = "gnh1201@catswords.re.kr";
 exports.global = global;
 exports.require = global.require;