Update external resources
ODE generates external resources in order to call compiler and other services. When project definition changes, you are usually prompted for updating external resources. When the GUI context project is not yet selected after starting the ClassEditor, one may select it from the project list (drop list above the class tree, left side).
Normally, source code and header files have already been created in Sample/SampleGUI/qlib and Sample/SampleGUI/h. When this is not the case, one may generate sources and header files by clicking the appropriate menu items.
Generate project definitions creates command files for compiling and linking project resources. This is, usually, done automatically.