new SelectFieldAction(this, new FieldSelectorUpdateHandler(parameterPosition), this);
// treat insert field as parameter edit
selectFieldAction.setFocusReturn(paramTextField);
final BorderlessButton button = new BorderlessButton(selectFieldAction);
final TooltipLabel tooltipLabel = new TooltipLabel(description);
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = parameterPosition;
gbc.anchor = GridBagConstraints.WEST;