MessageBox.show with YesNoCancel buttons displays only Yes and No buttons in a MC65

Hi everyone. I can't find the reason why the following code behaves different in MC65 and MC75:

 

 

MessageBox.Show("My message", "Caption", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question, MessageBoxDefaultButton.Button3);

 

 

In MC65 it only shows the "Yes" and "No" buttons, whilst in MC75 it shows "Yes", "No" and "Cancel" button.

 

 

MC65: Windows Embedded Handheld 6.5 Profesional. SO CE 5.2.29256 (Build 29256.5.3.12.30)

MC75A: Windows Embedded Handheld 6.5 Profesional. CE OS 5.2.29040 (Build 29040.5.3.12)