🚀 go-pugleaf

Dear All,
I meet a problem again
I want to make a effect to control the keyboard input
press SHIFT, and press Right Arrow
for example to select a text
by the code
 step 1: keybd_event(VK_SHIFT, 0, 0,0);
 step 2: keybd_event(39, 0, 0,0);
 step 3: keybd_event(39, 0, KEYEVENTF_KEYUP,0);
 step 4: keybd_event(39, 0, 0,0);
 step 5: keybd_event(39, 0, KEYEVENTF_KEYUP,0);
 step 6: keybd_event(VK_SHIFT, 0, KEYEVENTF_KEYUP,0);

but I find that when process step 2,
the application auto recieve a keybd_event(VK_SHIFT, 0, KEYEVENTF_KEYUP,0); 
signal,
such that the step 1 is useless,

 step 1: keybd_event(VK_SHIFT, 0, 0,0);
         keybd_event(VK_SHIFT, 0, KEYEVENTF_KEYUP,0);
 step 2: keybd_event(39, 0, 0,0);
 step 3: keybd_event(39, 0, KEYEVENTF_KEYUP,0);
 step 4: keybd_event(39, 0, 0,0);
 step 5: keybd_event(39, 0, KEYEVENTF_KEYUP,0);
 step 6: keybd_event(VK_SHIFT, 0, KEYEVENTF_KEYUP,0);

How can I send a message to the keyboard
 keybd_event(VK_SHIFT, 0, 0,0);
 keybd_event(39, 0, 0,0);
 such that the keyboard know that the key "Shift + Right Arrow" are pressed 
as the same time?

Thank