added tooltip to marker; this should fix issue #10

simpleexample2/fxui/src/main/java/simpleex/ui/AbstractFxAppController.java

 package simpleex.ui;
 
+import java.util.Iterator;
+
 import com.fasterxml.jackson.databind.ObjectMapper;
 import fxmapcontrol.Location;
 import fxmapcontrol.MapBase;
@@ -8,16 +10,22 @@ import fxmapcontrol.MapNode;
 import fxmapcontrol.MapProjection;
 import javafx.collections.FXCollections;
 import javafx.fxml.FXML;
+import javafx.geometry.Insets;
 import javafx.geometry.Point2D;
 import javafx.scene.Node;
 import javafx.scene.control.Alert;
 import javafx.scene.control.Alert.AlertType;
+import javafx.scene.layout.HBox;
 import javafx.util.Callback;
 import javafx.scene.control.ButtonType;
+import javafx.scene.control.Label;
 import javafx.scene.control.ListCell;
 import javafx.scene.control.ListView;
+import javafx.scene.control.OverrunStyle;
 import javafx.scene.control.Slider;
+import javafx.scene.control.Tooltip;
 import simpleex.core.LatLong;
+import simpleex.core.MetaData;
 import simpleex.json.LatLongsModule;
 
 /*
@@ -66,6 +74,8 @@ public abstract class AbstractFxAppController {
   private MapMarker marker = null;
   private DraggableNodeController draggableMapController = null;
   private DraggableNodeController draggableMarkerController = null;
+  private Tooltip markerTooltip = null;
+  
   
   @FXML
   private Slider zoomSlider;
@@ -133,6 +143,71 @@ public abstract class AbstractFxAppController {
         mapView.setCenter(marker.getLocation());
       }
     }
+    prepareMarkerTooltip();
+  }
+  
+  void prepareMarkerTooltip() {
+	  if ((marker != null) && (this.markerTooltip != null)) {
+		  Tooltip.uninstall(marker, markerTooltip);
+	  }
+	  
+	  Tooltip tooltip = new Tooltip();
+	  tooltip.setPrefWidth(300.0);
+	  tooltip.setWrapText(true);
+	  tooltip.setTextOverrun(OverrunStyle.ELLIPSIS);
+	  tooltip.setStyle(" -fx-background: rgba(255, 237, 131);\r\n" + 
+	  		"    -fx-text-fill: black;\r\n" + 
+	  		"    -fx-background-color: rgba(255, 237, 131, 0.8);\r\n" + 
+	  		"    -fx-background-radius: 6px;\r\n" + 
+	  		"    -fx-background-insets: 0;\r\n" + 
+	  		"    -fx-padding: 0.667em 0.75em 0.667em 0.75em; /* 10px */\r\n" + 
+	  		"    -fx-effect: dropshadow( three-pass-box , rgba(0,0,0,0.5) , 10, 0.0 , 0 , 3 );\r\n" + 
+	  		"    -fx-font-size: 0.85em;");
+	  
+	  final int num = locationListView.getSelectionModel().getSelectedIndex();
+		if (num >= 0) {
+			final LatLong latLong = dataAccess.getLatLong(num);
+			String tooltipText = "";
+			if(latLong.hasMetaData()) {
+				if(latLong.getMetaData().hasProperty(MetaData.NAME_PROPERTY)) {
+					tooltipText += latLong.getMetaData().getProperty(MetaData.NAME_PROPERTY) +"\n"; 
+				}
+				tooltipText += latLong.toString()+"\n"; 
+				if(latLong.getMetaData().hasProperty(MetaData.DESCRIPTION_PROPERTY)) {
+					tooltipText += latLong.getMetaData().getProperty(MetaData.DESCRIPTION_PROPERTY) +"\n"; 
+				}
+				MetaData metaData = latLong.getMetaData();
+				
+				final Iterator<String> props = metaData.propertyNames();
+			    if (props.hasNext()) {
+			    	String propString = "\n";
+			        while (props.hasNext()) {
+			        	String propName = props.next();
+			        	if((propName != MetaData.NAME_PROPERTY)
+			        			&&(propName != MetaData.DESCRIPTION_PROPERTY)) {
+			        		propString +=  propName + ":" + metaData.getProperty(propName) + "\n";
+			        	}
+			        }
+			        if(!propString.isBlank()) tooltipText +=  propString + "\n";
+			    }
+				
+				
+				final Iterator<String> tags = metaData.tags();
+			      if (tags.hasNext()) {
+			        String tagString = "\n| ";
+			        while (tags.hasNext()) {
+			        	tagString += tags.next() + " | ";
+			        }
+			        tooltipText +=  tagString + "\n";
+			      }
+			      
+			} else {
+				tooltipText += latLong.toString();
+			}
+			tooltip.setText(tooltipText);
+		}
+		this.markerTooltip = tooltip;
+		Tooltip.install(marker, tooltip);
   }
 
   @FXML