I want to create a custom library with different function callbacks?

I want to create a custom library with subsystems that I have created. The problem is that, whenever I open the library, all the scripts are executed...I have 2009 Matlab version, and there is no callback like Mask*fcn. I need to implement callback functions whenever I change the popup in the mask diagram. 2) Also, i need to plot the graphs via matlab with the values that I obtain in the simulation, I do it after stopFcn callback. But the function doesn't see the variables in the current workspace. HOw do I do it?(save--> load workspace.mdl)