I want to open an image then a push button becomes enabled in MATLAB. How to?

I have following matlab GUI code.

clear all;
clc;

win = figure('units','points',...
    'position',[200 250 500 400],...
    'color',[.8 .8 .8],...
    'menubar','none',...
    'resize','off',...
    'numbertitle','off',...
    'name','test window');

menu = uimenu('parent',win,...
    'Label','File');

submenu1 = uimenu('parent',menu,...
    'Label','Open');

submenu2 = uimenu('parent',menu,...
    'Label','Exit',...
    'Callback','close');

frame1 = u开发者_StackOverflowicontrol('parent',win,...
    'units','points',...
    'position',[30 170 200 200],...
    'backgroundcolor',[.9 .9 .9],...
    'style','Frame');

recButton = uicontrol('parent',win,...
    'units','points',...
    'position',[90 130 70 30],...
    'style','pushbutton',...
    'string','Button');

What I want to do is load an image with Open submenu (submenu1) and then display it inside frame1. I want recButton is disabled by default. After the image is loaded recButton becomes enabled. Can you help me with the code?

You should first create the recButton control with its 'Enable' property set to 'off'. Then in the callback that's executed for submenu1 you should re-enable the recButton control:

set(recButton,'Enable','on');

You would just have to make sure that the handle variable recButton is available in the callback for submenu1.