Return Value
A System.Windows.Forms.Form value that represents the pan window.
Pan window will show only when the owner form is loaded, and when the owner form is closed, pan window will be closed too.
If pan window has been shown to call this method will do nothing.
Pan window will move as the owner form move if it is showed by this method.
Pan window's System.Windows.Forms.Form.StartPosition is System.Windows.Forms.FormStartPosition.Manual, and its System.Windows.Forms.Form.Size and System.Windows.Forms.Form.Location depends on owner form if the pan window is showed by this method.