I have received help on this code and have gotten further with it, but I cannot get a couple of other things to work. The code should allow you to select either transistor or diode (radio buttons) and this enables/disables the correct cluster. However, I cannot click my second radio button (labeled diode). It is stuck on transistor, but I can still enter in data for the diode cluster. This cluster should only be available if diode is selected. In addition to this, I am trying to make it so that if a user decides to change one of the device paramenters in the array, that they do not enter data in both transistor and diode parameters (clusters). This is done by disabling the nonselected cluster until the data in the selected cluster is cleared (zeros entered). Also, the radio button of the nonselected device should be disabled at this time. My vi is attached. Thank you for your help. I look forward to getting this working.