how to add a button to Windows CE 6 aygshell menu bar and link to a library function?

Dear fellow Windows CE developers,

I want to make a button available in the aygshell menu bar of Windows CE 6, that shows or hides the software input panel (SIP) of a Windows CE 6 r3 system.

My questions now are:

1. What is the best way to add a soft keyboard button to an application specific toolbar?
2. How can I add a button programmatically (to an App specific aygshell toolbar) and link a library to it?

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I have to accomplish this in Visual Studio 2005, Windows CE 6 r3 and the C++ BSP code.

1. First approach was to find some settings for the aygshell, that make this automatically for me (since a software keyboard seems quite common), but i wasn't successful.

2. Second approach was to add a menu bar button and connect it to a library, that calls SipShowIM. I couldn't make it work, therefore I'd be happy if you guys could help me with good explained tutorials or links, better than the MSDN stuff. My steps were

   • in the graphical form development, I added a menu and there some menu items
   • in the source file to the form (but not the Dlg source) I added the library with the SIP functionality to the according method.

void CaygshellbarApp::OnSipButton() {

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...

SipGetinfo( &info );

bool visible = (info.fdwFlags & SIPF_ON);

SipShowIM(visible? SIPF_ON : SIPF_OFF);

}

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I would be very glad for any good documentation links or some hints, how I can get this done. The MSDN info was so far not enough.