use local gtk show initiation instead of show_all method

src/Abstract/Entity/Button.php

@@ -23,6 +23,10 @@ abstract class Button
             $this->_label
         );
 
+        // Render
+        $this->gtk->show();
+
+        // Init events
         $this->gtk->connect(
             'clicked',
             function(

src/Abstract/Entity/Entry.php

@@ -28,6 +28,10 @@ abstract class Entry
             $this->_value
         );
 
+        // Render
+        $this->gtk->show();
+
+        // Init events
         $this->gtk->connect(
             'activate',
             function(