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From: Manish Agarwal on 8 Jun 2010 08:11
Hello,

I am implementing a control derived from
System.Windows.Forms.UserControl class. This look like something
similar to Visual Studio 2005's dockable tab control for callstack,
output, watch window etc.

In my control class, I am overriding following method.

override void WndProc(ref System.Windows.Forms.Message m)

In this method, I am checking m.Msg for following messages:

WM_ACTIVATE, WM_SETFOCUS, WM_KILLFOCUS etc. but there is no
notification come even if I change the focus from my UserControl.

I am getting notification for WM_PARENTNOTIFY and for my user defined
messages.

Please suggest, what I am missing here.

Regards,
Manish Agarwal
From: Peter Duniho on 9 Jun 2010 00:20
Manish Agarwal wrote:
> Hello,
>
> I am implementing a control derived from
> System.Windows.Forms.UserControl class. This look like something
> similar to Visual Studio 2005's dockable tab control for callstack,
> output, watch window etc.
>
> In my control class, I am overriding following method.
>
> override void WndProc(ref System.Windows.Forms.Message m)
>
> In this method, I am checking m.Msg for following messages:
>
> WM_ACTIVATE, WM_SETFOCUS, WM_KILLFOCUS etc. but there is no
> notification come even if I change the focus from my UserControl.
>
> I am getting notification for WM_PARENTNOTIFY and for my user defined
> messages.
>
> Please suggest, what I am missing here.

No one can say for sure what you are missing if you don't post the code.

But you should make sure that your control sub-class returns "true" for
CanFocus.

You should also make sure that UserControl is really the most suitable
base class for your control. The name implies a more general-purpose
class than it really is; it's actually a "designable" composite control
that can contain other controls. Fully custom controls that are
complete controls unto themselves, without additional child controls
contained within, are better implemented as sub-classes of Control, not
UserControl.

Pete
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