Send Hot key deactivates itself

Help
1

Hi, I have an application where I perform a click followed by a send hot key - pgdown.

However, after I clicked, the window would deactivates itself before sending pagedown, which meant it couldnt perform hot key on the window.
I’ve tried checking click before typing, send windows messages, activate etc.

May I ask how the mechanism of send hot key defer from human pressing the keys? Would like to understand how it doesnt work on robot.

2

I am also facing similar problem, I managed this with the help “Click Image” ie click on scroll bar…