inpboxecece(vlabel, vcombo1, vcombo2, inp)
inpboxecece.png
To get the menu, just use the following code:
vlabel<-c('matrix1','combo1','matrix2','combo2','matrix3')
vcombo1<-c('a','b','c','d')
vcombo2<-c('1','2','3','4')
inp<-c('M','1','N','2','S')
ans<-inpboxecece(vlabel, vcombo1, vcombo2,inp)