}
}
public void removeAll() {
TestCampaignTreeModel model = (TestCampaignTreeModel) tree.getModel();
model.removeAll();
// remove also testbeds
for (int colIndex = 1; colIndex < this.getModel().getColumnCount(); colIndex++) {
String colName = this.getModel().getColumnName(colIndex);
if (this.convertColumnIndexToView(colIndex) == -1) {
continue;