@Override
                public void modifyText(ModifyEvent e)
                {
                    feedbackLabel.setText(""); //$NON-NLS-1$
                    if (TextHexInputGroup.this == findGroup) {
                        enableDisableControls();
                    }
                }
Group with text/hex selector and text input
plugins/org.jkiss.dbeaver.ui.editors.hex/src/org/jkiss/dbeaver/ui/editors/binary/dialogs/FindReplaceDialog.java