There are different possible ways to drag dashboard widgets to your Mac OS desktop. Here is the one simple solution to drag dashboard widgets to desktop window.
This command enables widgets to be placed onto the desktop.
Drag a widget around and press F12 to drag it onto the desktop. Repeat the process again to drag a widget back onto the dashboard.
defaults write com.apple.dashboard devmode YES
This may need you to log off or restart for it to take effect.