title: Libgdx scrollPane not scrolling after i added a scrollPaneStyel
body: <p>My scrollPane is not scrolling when i add ScrollPaneStyle, does anyone know why is happinging?</p>
  
  <pre><code>scroller = new ScrollPane( myWidget , skin);
          scroller.setBounds(0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
          this.addActor(scroller);
          scroller.setLayoutEnabled( true );
          scroller.setCancelTouchFocus( true );
          ScrollPaneStyle paneStyle = new ScrollPaneStyle();
          Texture tex = new Texture(Gdx.files.internal(filepath + "page.png"));
          tex.setWrap(Texture.TextureWrap.Repeat, Texture.TextureWrap.ClampToEdge);
          paneStyle.background = new SpriteDrawable( new Sprite(tex));
  
          scroller.setScrollbarsOnTop(true);
          scroller.setStyle(paneStyle);
  </code></pre>