Changed the default canDisconnect to false.

refs 2203

org.fortiss.tooling.base.ui/trunk/src/org/fortiss/tooling/base/ui/compose/ConnectionCompositorBase.java

@@ -94,7 +94,7 @@ abstract class ConnectionCompositorBase<HE extends IHierarchicElement, S extends
 	/** {@inheritDoc} */
 	@Override
 	public boolean canDisconnect(EObject connection) {
-		return true;
+		return false;
 	}
 
 	/** {@inheritDoc} */