Red Deer is not able to locate a ComboBox within a group

The context is creating a new maven project. The recorder is able to correctly record the following statements:

new ShellMenu("File","New","Other...").select();
new DefaultTreeItem("Maven","Maven Project").select();
new PushButton("Next >").click();
new CheckBox("Create a simple project (skip archetype selection)").toggle(true);
new PushButton("Next >").click();
new DefaultCombo(new DefaultGroup("Artifact"),"Group Id:").setText("Test100");
new DefaultCombo(new DefaultGroup("Artifact"),"Artifact Id:").setText("test100");
new PushButton("Finish").click();

But - these statements fail when the test is run - 'no matching widget':

new DefaultCombo(new DefaultGroup("Artifact"),"Group Id:").setText("Test100");
new DefaultCombo(new DefaultGroup("Artifact"),"Artifact Id:").setText("test100");