Windows cannot display until I focus this program.

[Tea6098]

Some windows idle for a while.
When I change the texture to this window, it cannot display.
But it still in the UwcManager.windows
I cannot find the difference from other windows which display smoothly.
(I have check the isValid, IsAlive, IsVisible, but all of them is same)
Can I check the windows variable to remove it from my dropdown or request a message to restart the window to display?
Thank you very much.