public object ShowWindow( 
   string windowTitle,
   FrameworkElement windowContents,
   bool isModal,
   EventHandler<CancelEventArgs> onHidingHandler,
   EventHandler onHideHandler,
   WindowType windowType,
   Nullable<double> top,
   Nullable<double> left
)

Parameters

windowTitle

Title of the window

windowContents

Contents to be displayed in the window

isModal

Determines wheter the window is modal or not

onHidingHandler

Event handler invoked when window is being hidden, and can be handled to cancel window closure

onHideHandler

Event handler invoked when the window is hidden

windowType

Determines the type of the window

top

The distance from the top of the application at which to position the window

left

The distance from the left of the application at which to position the window

Return Value

Target Platforms: Windows XP Professional, Windows Server 2003 family, Windows Vista, Windows Server 2008 family

Reference