MATLAB: Overwrite an existing GUI

Question

good night everybody, is there anyone that knows anyfunction to count number of opened graphs because in my GUI, in the 1st interfaace I have a pusbutton and it is generating variables on another interface depends on the values entered by the user. When user wants to generate any other variables I want to overwrite the existing one so I guess it maybe possible to know the amount of figures and close all except 1st one, or how can I overwrite an existing table, I could not check the handle of table because handle is erased just after creation or not exist before execution for any suggestion thanks in advance good weekends

Answer 1

figurehandles = findall(0, '-type', 'figure');
number_of_figures_open = length(figurehandles);