How to find element from popup (confirm) windows

[shaobo-zhang-senscomm]

While I try to delete device, a confirm windows will popup. How can I find elements from popup windows.
I try print(driver.page_source), didn't get any info about it.

[shaobo-zhang-senscomm]

is this the same issue
#292

[AwineshKumar]

I am getting same issue. It unable to find element of a modal view by automation id.
Appium inspector stuck when a modal view opened. There is error related to GetPageSource.