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diff --git a/org.argeo.cms.jcr.ui/src/org/argeo/cms/e4/maintenance/AbstractOsgiComposite.java b/org.argeo.cms.jcr.ui/src/org/argeo/cms/e4/maintenance/AbstractOsgiComposite.java
new file mode 100644
index 0000000..4fd1d68
--- /dev/null
+++ b/org.argeo.cms.jcr.ui/src/org/argeo/cms/e4/maintenance/AbstractOsgiComposite.java
@@ -0,0 +1,41 @@
+package org.argeo.cms.e4.maintenance;
+
+import java.util.Collection;
+
+import org.argeo.api.cms.CmsLog;
+import org.argeo.cms.swt.CmsSwtUtils;
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.layout.GridData;
+import org.eclipse.swt.widgets.Composite;
+import org.osgi.framework.BundleContext;
+import org.osgi.framework.FrameworkUtil;
+import org.osgi.framework.InvalidSyntaxException;
+import org.osgi.framework.ServiceReference;
+
+abstract class AbstractOsgiComposite extends Composite {
+	private static final long serialVersionUID = -4097415973477517137L;
+	protected final BundleContext bc = FrameworkUtil.getBundle(getClass()).getBundleContext();
+	protected final CmsLog log = CmsLog.getLog(getClass());
+
+	public AbstractOsgiComposite(Composite parent, int style) {
+		super(parent, style);
+		parent.setLayout(CmsSwtUtils.noSpaceGridLayout());
+		setLayout(CmsSwtUtils.noSpaceGridLayout());
+		setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, false));
+		initUi(style);
+	}
+
+	protected abstract void initUi(int style);
+
+	protected <T> T getService(Class<? extends T> clazz) {
+		return bc.getService(bc.getServiceReference(clazz));
+	}
+
+	protected <T> Collection<ServiceReference<T>> getServiceReferences(Class<T> clazz, String filter) {
+		try {
+			return bc.getServiceReferences(clazz, filter);
+		} catch (InvalidSyntaxException e) {
+			throw new IllegalArgumentException("Filter " + filter + " is invalid", e);
+		}
+	}
+}