diff --git a/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/ui/components/PersonFilter.java b/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/ui/components/PersonFilter.java
new file mode 100644
index 0000000..66d7f92
--- /dev/null
+++ b/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/ui/components/PersonFilter.java
@@ -0,0 +1,56 @@
+package de.kreth.vaadin.clubhelper.vaadinclubhelper.ui.components;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import com.vaadin.server.SerializablePredicate;
+
+import de.kreth.vaadin.clubhelper.vaadinclubhelper.data.GroupDef;
+import de.kreth.vaadin.clubhelper.vaadinclubhelper.data.Person;
+
+public class PersonFilter implements SerializablePredicate<Person> {
+
+	private static final long serialVersionUID = -8481035921020651601L;
+	private Set<Integer> selectedPersons = null;
+	private Set<GroupDef> selectedGroups = null;
+
+	@Override
+	public boolean test(Person t) {
+		if (selectedGroups == null && selectedPersons == null) {
+			return true;
+		}
+
+		if (personSelected(t) == false) {
+			return false;
+		}
+//		if (personInGroup(t) == false) {
+//			return false;
+//		}
+		return true;
+	}
+
+	private boolean personInGroup(Person t) {
+		return selectedGroups != null;
+	}
+
+	private boolean personSelected(Person t) {
+		if (selectedPersons != null) {
+			if (selectedPersons.contains(t.getId()) == false) {
+				return false;
+			}
+		}
+		return true;
+	}
+
+	public void setSelected(Set<Person> selected) {
+		if (selected == null) {
+			selectedPersons = null;
+			return;
+		}
+		selectedPersons = new HashSet<>();
+		for (Person p : selected) {
+			selectedPersons.add(p.getId());
+		}
+	}
+
+}
diff --git a/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/ui/components/PersonGrid.java b/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/ui/components/PersonGrid.java
index 2ae1872..6157cff 100644
--- a/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/ui/components/PersonGrid.java
+++ b/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/ui/components/PersonGrid.java
@@ -83,6 +83,7 @@ public class PersonGrid extends CustomComponent {
 		HorizontalLayout filters = new HorizontalLayout();
 		filters.addComponents(checkIncluded, comboGroups);
 		dataProvider = new ListDataProvider<Person>(new ArrayList<>()).withConfigurableFilter();
+
 		grid = new Grid<>();
 		grid.setDataProvider(dataProvider);
 		grid.setId("person.grid");
@@ -140,15 +141,13 @@ public class PersonGrid extends CustomComponent {
 			});
 
 			filter = filter.and(p -> {
-				{
-					List<GroupDef> personGroups = p.getPersongroups();
-					for (GroupDef pg : personGroups) {
-						if (groupIds.contains(pg.getId())) {
-							return true;
-						}
+				List<GroupDef> personGroups = p.getPersongroups();
+				for (GroupDef pg : personGroups) {
+					if (groupIds.contains(pg.getId())) {
+						return true;
 					}
-					return false;
 				}
+				return false;
 			});
 		}
 
@@ -157,7 +156,7 @@ public class PersonGrid extends CustomComponent {
 
 	public void setFilter(Predicate<Person> filter) {
 		dataProvider.setFilter(p -> filter.test(p));
-		grid.getDataProvider().refreshAll();
+		dataProvider.refreshAll();
 	}
 
 	public void onPersonSelect(SelectionListener<Person> listener) throws UnsupportedOperationException {
diff --git a/src/test/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/ui/components/PersonFilterTest.java b/src/test/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/ui/components/PersonFilterTest.java
new file mode 100644
index 0000000..51b119b
--- /dev/null
+++ b/src/test/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/ui/components/PersonFilterTest.java
@@ -0,0 +1,69 @@
+package de.kreth.vaadin.clubhelper.vaadinclubhelper.ui.components;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import de.kreth.vaadin.clubhelper.vaadinclubhelper.dao.AbstractDatabaseTest;
+import de.kreth.vaadin.clubhelper.vaadinclubhelper.data.Person;
+
+class PersonFilterTest {
+
+	private PersonFilter filter;
+	private List<Person> persons;
+
+	@BeforeEach
+	void setUp() throws Exception {
+		filter = new PersonFilter();
+		persons = AbstractDatabaseTest.createPersons(5);
+		assertEquals(5, persons.size());
+	}
+
+	@Test
+	void testNoFilterSet() {
+		allAccepted();
+
+		assertTrue(filter.test(null));
+	}
+
+	@Test
+	void testSelectionFilter() {
+		Set<Person> selected = new HashSet<>(persons.subList(2, 4));
+		filter.setSelected(selected);
+		assertFalse(filter.test(persons.get(0)));
+		assertFalse(filter.test(persons.get(1)));
+		assertFalse(filter.test(persons.get(4)));
+		assertTrue(filter.test(persons.get(2)));
+		assertTrue(filter.test(persons.get(3)));
+
+		filter.setSelected(null);
+		testNoFilterSet();
+
+		filter.setSelected(Collections.emptySet());
+		allFiltered();
+
+		filter.setSelected(new HashSet<>(persons));
+		allAccepted();
+	}
+
+	public void allAccepted() {
+		for (Person p : persons) {
+			assertTrue(filter.test(p));
+		}
+	}
+
+	public void allFiltered() {
+		for (Person p : persons) {
+			assertFalse(filter.test(p));
+		}
+	}
+
+}