Gray shading

When we modify the source code of an RMC, RSSG or SCFG, but generated before that a graph, equation system or computed a solution for the previous version of the model, then all the tabs retain their contents, but their background becomes gray(fig. 14) meaning that they are not up to date with the sourcecode. The user can still save the contents of them to a file, but it is forced to Parse the file again before doing anything else as all the other options from the Run menu becomes not available.

Figure 14: Gray shading the previously generated graph source after the sourcecode has been changed