diff --git a/src/meshlab/dialogs/filter_dock_dialog.ui b/src/meshlab/dialogs/filter_dock_dialog.ui
index df7ad573c..4fa0e561b 100644
--- a/src/meshlab/dialogs/filter_dock_dialog.ui
+++ b/src/meshlab/dialogs/filter_dock_dialog.ui
@@ -87,19 +87,6 @@
           </property>
          </widget>
         </item>
-        <item>
-         <spacer name="verticalSpacer">
-          <property name="orientation">
-           <enum>Qt::Vertical</enum>
-          </property>
-          <property name="sizeHint" stdset="0">
-           <size>
-            <width>20</width>
-            <height>191</height>
-           </size>
-          </property>
-         </spacer>
-        </item>
        </layout>
       </widget>
      </widget>
diff --git a/src/meshlab/rich_parameter_gui/richparameterlistframe.cpp b/src/meshlab/rich_parameter_gui/richparameterlistframe.cpp
index ef2e8140c..1a50aaa57 100644
--- a/src/meshlab/rich_parameter_gui/richparameterlistframe.cpp
+++ b/src/meshlab/rich_parameter_gui/richparameterlistframe.cpp
@@ -134,10 +134,12 @@ void RichParameterListFrame::toggleAdvancedParameters()
 		if (hiddenFrame->isVisible()){
 			hiddenFrame->setVisible(false);
 			showHiddenFramePushButton->setText("▼");
+			showHiddenFramePushButton->setToolTip("Show advanced parameters");
 		}
 		else {
 			hiddenFrame->setVisible(true);
 			showHiddenFramePushButton->setText("▲");
+			showHiddenFramePushButton->setToolTip("Hide advanced parameters");
 		}
 	}
 	setMinimumSize(sizeHint());
@@ -205,15 +207,18 @@ void RichParameterListFrame::loadFrameContent(
 				wd->addWidgetToGridLayout(flay,j++);
 			}
 		}
-		//hiddenFrame->setMinimumSize(hiddenFrame->sizeHint());
 		glay->addWidget(hiddenFrame, i++, 0, 1, 3);
 		hiddenFrame->setVisible(false);
 		showHiddenFramePushButton = new QPushButton("", this);
 		showHiddenFramePushButton->setFlat(true);
 		showHiddenFramePushButton->setText("▼");
+		showHiddenFramePushButton->setToolTip("Show advanced parameters");
 		glay->addWidget(showHiddenFramePushButton, i++, 0, 1, 3);
 		connect(showHiddenFramePushButton, SIGNAL(clicked()), this, SLOT(toggleAdvancedParameters()));
 	}
+
+	QSpacerItem* spacer = new QSpacerItem(40, 20, QSizePolicy::Minimum, QSizePolicy::Expanding);
+	glay->addItem(spacer, i++, 0);
 	setLayout(glay);
 }