Fix multi control

Use multi control in example

examples/widgetapp/sample_page.e

@@ -21,22 +21,33 @@ create
 feature
 
 	initialize_controls
+		local
+			panel: WSF_MULTI_CONTROL
 		do
-			button := create {WSF_BUTTON_CONTROL}.make ("sample_button", "I'm a button")
-			button.set_click_event(agent handle_click)
-			control := button
+			button1 := create {WSF_BUTTON_CONTROL}.make ("sample_button1", "I'm a button")
+			button1.set_click_event (agent handle_click)
+			button2 := create {WSF_BUTTON_CONTROL}.make ("sample_button2", "I'm a button2")
+			button2.set_click_event (agent handle_click)
+			create panel.make ("panel")
+			panel.add_control (button1)
+			panel.add_control (button2)
+			control := panel
 		end
 
-	handle_click(context: WSF_PAGE_CONTROL)
-	do
-		if attached {SAMPLE_PAGE} context as sp then
-			sp.button.set_text("Hello World! (Ueeee)")
+	handle_click (context: WSF_PAGE_CONTROL)
+		do
+			if attached {SAMPLE_PAGE} context as sp then
+				sp.button1.set_text ("Hello World! (Ueeee)")
+				sp.button2.set_text ("Hi btn2")
+			end
 		end
-	end
 
 	process
 		do
 		end
 
-	button: WSF_BUTTON_CONTROL
+	button1: WSF_BUTTON_CONTROL
+
+	button2: WSF_BUTTON_CONTROL
+
 end