HeapViewer UI cleanup

Author: jisedlac

visualvm/heapviewer/src/com/sun/tools/visualvm/heapviewer/ui/HeapViewerComponent.java

@@ -57,6 +57,7 @@
 import org.netbeans.lib.profiler.ui.swing.ProfilerPopupMenu;
 import com.sun.tools.visualvm.heapviewer.HeapContext;
 import com.sun.tools.visualvm.heapviewer.HeapViewer;
+import java.awt.Dimension;
 import org.openide.util.Lookup;
 import org.openide.util.NbBundle;
 import org.openide.util.RequestProcessor;
@@ -89,6 +90,10 @@ public HeapViewerComponent(HeapViewer heapViewer) {
         });
     }
 
+    public Dimension getMinimumSize() {
+        return new Dimension(0, 0);
+    }
+    
     private void initImpl() {
         contexts = HeapContext.allContexts(heapViewer);