Capture keyboard event using NativeWindow

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C#

Hi everyone, I've tried to capture keyboard event (and the key data of course) for a specified form through a NativeWindow class by handling its WndProc function. For the first, I tried at the WndProc function of the form directly, and it works fine. And then, when I tried through NativeWindow, the WM_KEY* and WM_SYSKEY* never fired in its WndProc, but messages like mouse message is fired :

// Using NativeWindow
public class FormHook : NativeWindow {
    // some implementation
    protected override void WndProc(ref Message m) {
        switch (m.Msg) {
            // others messages that works on hooked form e.g : 
            // mouse message, paint message, etc.
            // fired perfectly.
            case 0x0100:	// WM_KEYDOWN
            case 0x0104:	// WM_SYSKEYDOWN
            case 0x0101:	// WM_KEYUP
            case 0x0105:	// WM_SYSKEYP
                // these event never fired.
                break;
            default:
                base.WndProc(ref m);
                break;
        }
    }
}

// Using Form
public class AForm : Form {
    // some implementation
    protected override void WndProc(ref Message m) {
        switch (m.Msg) {
            // others messages e.g : mouse message, paint message, etc.
            // fired perfectly.
            case 0x0100:	// WM_KEYDOWN
            case 0x0104:	// WM_SYSKEYDOWN
            case 0x0101:	// WM_KEYUP
            case 0x0105:	// WM_SYSKEYP
                // these event fired perfectly.
                break;
            default:
                base.WndProc(ref m);
                break;
        }
    }
}

This is the similar question by others on different forum.

Is there anything why only WM_KEY* and WM_SYSKEY* (as far as I know) that doesn't fired when using NativeWindow ? Or is there a way to catch keyboard event on a target form besides that way ?