I am trying to build a GUI for a code I've already written. I am hoping to have a drop box that lets the user choose two options and based on the option they choose I want to have a unique "next step" pop up. I.E. if they choose the option that requires them to enter a scalar number I want a text box to appear for them to enter the number, but if they choose the option that requires them to enter a vector, I want a push button to appear that allows them to load an excel file containing the vector. How can I accomplish this? Thank you.