diff --git a/src/main/java/eu/omp/irap/vespa/epntapclient/gui/ParamField.java b/src/main/java/eu/omp/irap/vespa/epntapclient/gui/ParamField.java
index ad35dcc..9b38eec 100644
--- a/src/main/java/eu/omp/irap/vespa/epntapclient/gui/ParamField.java
+++ b/src/main/java/eu/omp/irap/vespa/epntapclient/gui/ParamField.java
@@ -392,6 +392,7 @@ public abstract class ParamField extends JPanel {
 									"Can't get table names for the resolver", e);
 						}
 						comboBox.getEditor().setItem(content);
+						comboBox.showPopup();
 					}
 					if (content.isEmpty()) {
 						viewListener.onParameterRemoved(paramName);
--
libgit2 0.21.2