This is the list with the properties:
DialogHeight - this defines the height of the popup
DialogWidth - this defines the width of the popup
DialogLeft - this defines the popup's horizontal offset from the left edge of the screen
DialogTop - this defines the popup's vertical offset from the top edge of the screen
By default the browser popups are centered on the screen and are 500px by 500px. This also applies for the popup with the CompactButtons collection if it is invoked via the
<telerik:RadSocialButton />button with its SocialNetType property set to CompactButton instead of the
<telerik:RadCompactButton />which opens a centered popup that is autosized.