I assume you are using FT Studio Site Edition since you mentioned client. There are a couple methods you can use.
#1 When I am testing an application, I create an extra display. Let's call it "test". On that "test" display I add a button to open the display that I am developing. That is typically all I put on that "test" display. Just one button. Then on the display I am developing, I add a button that takes me to the "test" display. And of course that closes the display I am developing. So then when I click on the button to reopen my developed display it has been updated with any changes I have made.
#2 Create a Client Key file. This is my favorite underused tool in this software. Client keys allow you to use your keyboard to execute a command from anywhere in the client. So you could assign, say F1, to abort the all displays (abort *) and to open the desired display. I use this all the time. I typically assign F1 to open whatever the main display is. So from anywhere in the client, even if all displays have been closed, I can press F1 to get me back to my main display. Remember that you have to assign a Client key file to run when the client launches.
#3 On the display you are developing add a button to open that same display. That will refresh the screen. If for some reason it doesn't. Then add the abort command followed by the display command. But it should work without the abort.
OG