CSSTUDIO-2954 Add informative tooltips to the class VisibleWidget.

Author: abrahamwolk

app/display/model/src/main/java/org/csstudio/display/builder/model/widgets/VisibleWidget.java

@@ -57,7 +57,9 @@ protected void defineProperties(final List<WidgetProperty<?>> properties)
     {
         super.defineProperties(properties);
         properties.add(visible = propVisible.createProperty(this, true));
+        visible.setInformativeTooltip("Should the widget be visible?");
         properties.add(tooltip = propTooltip.createProperty(this, getInitialTooltip()));
+        tooltip.setInformativeTooltip("Text to display in the tooltip of the widget when hovering with the mouse over the widget.");
         // Start 'connected', assuming there are no PVs
         properties.add(connected = runtimePropConnected.createProperty(this, true));
     }