Update manual_tests.cpp

Author: gammasoft71

tests/xtd.forms.manual_tests/src/manual_tests.cpp

@@ -1,8 +1,21 @@
 #include <xtd/xtd>
 
-auto main()->int {
-  auto form1 = form::create("form1");
-  auto button1 = button::create(form1, "Click me", {10, 10});
-  button1.click += [&] {message_box::show(form1, "Hello !");};
-  application::run(form1);
+namespace manual_tests {
+  class form1 : public form {
+  public:
+    static auto main() {
+      application::system_controls(true);
+      application::run(form1 {});
+    }
+    
+    form1() {
+      text("form1");
+      button1.click += [&] {message_box::show(*this, "Hello, World! !");};
+    }
+    
+  private:
+    button button1 = button::create(*this, "button1", {10, 10});
+  };
 }
+
+startup_(manual_tests::form1::main);