browse_button.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(final SelectionEvent e) {
FileDialog dialog = new FileDialog (shell, SWT.OPEN);
dialog.setFilterNames (new String [] {"Server.met(*.met)", "All Files (*.*)"});
dialog.setFilterExtensions (new String [] {"*.met", "*.*"});
String result = dialog.open();
if (result != null)
file_path.setText(result);
} });