void ButtonBrowsePathsClicked (object sender, EventArgs e)
{
var dlg = new SelectFolderDialog (GettextCatalog.GetString ("Select directory")) {
TransientFor = this,
};
string defaultFolder = comboboxentryPath.Entry.Text;
if (string.IsNullOrEmpty (defaultFolder))
defaultFolder = IdeApp.ProjectOperations.ProjectsDefaultPath;
if (!string.IsNullOrEmpty (defaultFolder))
dlg.CurrentFolder = defaultFolder;
if (dlg.Run ())
comboboxentryPath.Entry.Text = dlg.SelectedFile;
}