This method will recursively search the child controls of each child control, until either a match is found, or all controls have been searched.
This method can not be used to get a reference to a child control located within TargetUrl. In case of controls located within the Page of TargetUrl,- a reference to the document and html elements can be obtain using JavaScript functionality on the client.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2