Question : How to save pointer function from a c++ dll to vb.net

Hello there,
I have a scenario which is difficult to resolve...

Where there are
app A = data source (vb.net exe)
C++ DLL
app B = (C++ exe)

Now
App B will call this in the dll to set up its pointer

extern "C" BOOL __cdecl Set(void* vParam){
//where it send address of its callback
theApp.OnRequestData=(ON_REQUEST_DATA) vParam;
}

theApp.OnRequestData is a mock function in the dll which I need to replace with a function in App A which is an exe.

How could i go from here to make App A link with the dll and so that App A will know where to send data to App B...

I am quite new with this concept please help with code of C# or VB in App A.

Many thanks,

Answer : How to save pointer function from a c++ dll to vb.net

That doesn't necessarily matter. Controls can be infront without being literally "in front".

Have you tried bringing that control to the front?
Right Click > Position > Bring To Front
(Also available on the Arrange Tab).