Question : Why can I not find the InvokeRequired and SetTextCallback Options

I am using:
Microsoft Visual Studio 2008
Version 9.0.30729.1 SP
Microsoft .NET Framework
Version 3.5 SP1

Installed Edition: Professional

I do not seem to have InvokeRequired and SetTextCallback as options.  I have included a couple of screenshots and demonstrate what I get when I try to find the InvokeRequired and SetTextCallback options. I've also included a list of the Systems statements.

Can somebody tell me what I'm missing here.

Thanks,
George

Answer : Why can I not find the InvokeRequired and SetTextCallback Options

SetTextCallback is a delegate that u need to create in order to enable asynchronous calls for setting
 the text property on a control.
check example here http://msdn.microsoft.com/en-us/library/ms171728(VS.80).aspx
   

InvokeRequired is a property of Control class, so if Snap_shot_Device_response_chart doesn't inherit from Control u won't find it.