An internal function that checks to see if a variables necessary for Histopath to run has been defined
Usage
checkSelction()
Arguments
Value
msg
A message to the user displaying all the values and variables that still need to be declared.
Details
This function relies on the global variables; GenderVar, GenderVal, GenerationVar, GenerationVal, AgeVar, AgeVal, and TreatmentVar.
All of these values are controlled by the GUI.