visual studio - C++ function Sleep() executes before piece of code -


i work in visual studio c++, windows form app. try paint button red, wait 3 seconds , paint blue. 

button1->backcolor = system::drawing::color::darkred; sleep(3000); button1->backcolor = system::drawing::color::cornflowerblue;

however, sleep() functions executes before first line (painting red). program starts waiting 3 seconds , after time paints button blue. seems painting red piece of code doesn't have time execute. individually, painting red works fine. i've tried other delay solutions also. example: 

int wait = clock() + 2 * clocks_per_sec; while (clock() < wait) {}

it seems issue in visual studio c++, because sleep() function have worked in code::blocks console script. have ideas of solution?

since button window can invalidate before calling sleep().
what invalidate,update methods in vc++


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