Window has a number of client-side properties and methods that you can use to manipulate the windows in the browser. These are:

Method Description
setSize Sets the size (width and height) of the window.
moveTo Sets the position (left, top) of the window.
center Centers the window in the middle of the page.
show Shows the window if it was invisible. If the window does not exist, show creates it.
hide Makes the window invisible.
minimize Minimizes the window.
maximize Maximizes the window.
restore Restores the window to its normal (non-minimized) state.
setUrl Changes URL of window.
get_navigateUrl Gets the URL of the window.
reload Reloads the content page in the window. The page should come from the same server as is the parent page.
close Closes the window.
argument An object that is transferred between the calling page and the window dialog.
BrowserWindow Returns a reference to the parent page's document. This is useful for calling functions on the parent page.
get_windowManager Returns a reference to the RadWindowManager. As an alternative you can use the ASP.NET AJAX convention and use $find(), e.g:
var oManager = $find("<%=WindowManager1.ClientID%>");
set_modal Sets the modality of the window. set_modal accepts a boolean value as an argument, e.g. oWnd.set_modal(true);
setActive
 Makes the window the active (topmost) window on the page.
set_width Sets the window width.
set_height Sets the window height.
get_width Gets the window's initial width.
get_height Gets the window's initial height.
set_title Sets window title. Note that if the content page has its own title set in the @Page directive or in the <head> section, this title will override the RadWindow's one.
set_status Displays content in the window status bar.
get_contentFrame Returns a reference to RadWindow's content area (IFRAME). One possible use is to to call a function that is declared in the RadWindow's page from the parent page. Another possible use is to modify the DOM.
isModal Returns true if the window is modal.
isClosed Returns true if the window is currently closed.
isPinned Returns true if the window is currently pinned.
togglePin Toggles whether the RadWindow is pinned.
isMaximized Returns true if the window is currently maximized.
isMinimized Returns true if the window is currently minimized.
isVisible Returns true if the window is currently visible.
isActive Returns true if the window is the currently active one.
set_offsetElementID Sets the OffsetElementId for the RadWindow.
set_behaviors Sets the Behaviors property of the RadWindow object. Its argument must be a value or combination of values from the Telerik.Web.UI.WindowBehaviors enum. To set more than one behavior, use "+". Possible values are None, Resize, Minimize, Close, Pin, Maximize, Move, Reload, Default
e.g: oWnd.set_behaviors( Web.UI.WindowBehaviors.Move + Web.UI.WindowBehaviors.Close )
set_openerElementID Sets the OpenerElementId for the RadWindow.
add_close Sets a function that will be called when a RadWindow is closed.
getWindowBounds

Returns the size and position of the RadWindow

e.g:

var bounds = oWnd.getWindowBounds();

bounds.x; //returns the current left position of the RadWindow

bounds.y; //returns the current top position of the RadWindow

bounds.height; //returns the current height of the RadWindow

bounds.width; //returns the current width of the RadWindow