how to make image tilt correction by user input

i am developing a semi user interface , in which if i want to introduce a user input in which a popup window should come and asking that ''do you want to tilt the image with yes or no option ? what should i do. if i press yes again one window should open and ask me to put the required angle through which you want to rotate the figure. if i press no. program should proceed as before. i have tried like this but not working . please help me out

if true
  % code
              dlgTitle    = 'Tilt correction?';
             %  dlgQuestion = 'Do you wish to Tilt the image?';
           %  choice = questdlg(dlgQuestion,dlgTitle,'Yes','No', 'Yes');
                prompt={'Enter a value of \theta (in degrees)'};
                name = 'Tilt correction';
              defaultans = {'30'};
                options.Interpreter = 'tex';
                 answer = inputdlg(prompt,name,[1 40],defaultans,options);
                 end