diff --git a/src/gui/widget/shellwindow.cpp b/src/gui/widget/shellwindow.cpp
index d7e4c7f9a..c108e3edf 100644
--- a/src/gui/widget/shellwindow.cpp
+++ b/src/gui/widget/shellwindow.cpp
@@ -156,7 +156,8 @@ void CShellWindow::exec()
 
 					//callback for line handler
 					std::string s_output = std::string((output));
-					OnShellOutputLoop(s_output);
+					OnShellOutputLoop(s_output, res, &ok);
+					dprintf(DEBUG_NORMAL,  "[CShellWindow] [%s - %d]  res=%d ok=%d\n", __func__, __LINE__, *res, ok);
 					if (lines.size() > lines_max)
 						lines.pop_front();
 					txt = "";
@@ -200,12 +201,14 @@ void CShellWindow::exec()
 	errno = 0;
 	int r = waitpid(pid, &s, 0);
 
-	if (res) {
-		dprintf(DEBUG_NORMAL,  "[CShellWindow] [%s - %d]  res=%d, error[%d]: %s\n", __func__, __LINE__, *res, errno, strerror(errno));
-		if (r == -1)
-			*res = errno;
-		else
-			*res = WEXITSTATUS(s);
+	if (res){
+		//if res value was generated inside signal, then use foreign res from signal instead own res value
+		if (OnShellOutputLoop.empty()){
+			if (r == -1)
+				*res = errno;
+			else
+				*res = WEXITSTATUS(s);
+		}
 	}
 
 	showResult();
@@ -220,12 +223,14 @@ void CShellWindow::showResult()
 		if (mode & ACKNOWLEDGE){
 			show_button = true;
 		}
-		else if (mode & ACKNOWLEDGE_MSG){
+		else if (mode & ACKNOWLEDGE_EVENT){
 			if (*res != 0){
-				DisplayErrorMessage("Please press button");
+				OnResultError(res);
+				if (OnResultError.empty())
+					DisplayErrorMessage("Error while execution of task. Please see window for details!");
 				show_button = true;
 			}else{
-				DisplayInfoMessage("...ready. Please press OK");
+				OnResultOk(res);
 				exit = true;
 			}
 		}
@@ -235,7 +240,7 @@ void CShellWindow::showResult()
 			int b_height = 35;
 			int xpos = frameBuffer->getScreenWidth() - b_width;
 			int ypos = frameBuffer->getScreenHeight() - b_height;
-			CComponentsButton btn(xpos, ypos, b_width, b_height, LOCALE_MESSAGEBOX_OK, NEUTRINO_ICON_BUTTON_OKAY, NULL, true, true);
+			CComponentsButton btn(xpos, ypos, b_width, b_height, LOCALE_MESSAGEBOX_BACK, NEUTRINO_ICON_BUTTON_OKAY, NULL, true, true);
 			btn.paint();
 		}
 
diff --git a/src/gui/widget/shellwindow.h b/src/gui/widget/shellwindow.h
index 45d4cda84..9812c4b11 100644
--- a/src/gui/widget/shellwindow.h
+++ b/src/gui/widget/shellwindow.h
@@ -47,9 +47,9 @@ class CShellWindow : public sigc::trackable
 	public:
 		enum shellwindow_modes
 		{
-			VERBOSE 	= 1,
-			ACKNOWLEDGE 	= 2,
-			ACKNOWLEDGE_MSG	= 4
+			VERBOSE 		= 1,
+			ACKNOWLEDGE 		= 2,
+			ACKNOWLEDGE_EVENT	= 4
 		};
 		CShellWindow(const std::string &Command, const int Mode = 0, int* Res = NULL, bool auto_exec = true);
 		~CShellWindow();
@@ -79,7 +79,36 @@ class CShellWindow : public sigc::trackable
 			shell.exec();
 		...other code...
 		*/
-		sigc::signal<void, std::string&> OnShellOutputLoop;
+		sigc::signal<void, std::string&, int*, bool*> OnShellOutputLoop;
+
+		/*!
+		signal/event handler runs after task is finished.
+		NOTE: works only with ACKNOWLEDGE_EVENT mode
+		After executed task comes a default messages (see method showResult()), but with these slots it is possible to use other messages
+		or any desired action without any touching this class.
+		Example for implementation in foreign class let show an alternate message than default message:
+		...your code...
+			//assuming in your foreign class is declared a member function named YourMemberFunction() without return value and int* as parmeter This method should run
+			instead the default message.
+
+			//declare a slot with return value as 'void' and wihout any parameter
+			sigc::slot<void, int*> sl;
+
+			//fill the slot with your member function in your class with your action
+			sl = sigc::mem_fun(*this, &CYourClass::YourMemberFunction);
+
+			//create the CShellWindow object in verbose mode, important: parameter 'auto_exec' must be set to 'false', so it is possible to connect the slot before engages the exec() methode
+			CShellWindow shell(cmd, (verbose ? CShellWindow::VERBOSE : 0) | (acknowledge ? CShellWindow::ACKNOWLEDGE_MSG : 0), &res, false);
+
+			//connect slot
+			shell1.OnResultError.connect(sl);
+
+			//now exec...
+			shell.exec();
+		...other code...
+		*/
+		sigc::signal<void, int*> OnResultError;
+		sigc::signal<void, int*> OnResultOk;
 };
 
 #endif