Why does opening a dialog clear the page underneath it?
In one of the master-detail pages in my app, there is a button in the detail pane that opens a dialog when the button is clicked (the "Click" event of the button executes the "Open as dialog" action to open the dialog). That is all working fine.
However, when the dialog opens, the page underneath it turns all white. When the dialog is closed, I am returned to the master-detail page, but without the detail visible that was there when the dialog was opened.
This does not seem correct to me. When the dialog is opened, the master-detail content underneath it should remain exactly as-is, and should be there unchanged when the dialog is closed.
Why does this happen?