Intercepting closing DropDown of a ComboBox

[Carlo]

Good morning

I've not found an event that notify me when drop-down part of a BomboBox is
closed. OnDropDown just notify when the drop-down is displayed, not when it
is closed.

Is there a message in WndProc that can be used to intercept a drop-down
closing?

Thank you very much.

Carlo

 

[Herfried K. Wagner [MVP]]

I've not found an event that notify me when drop-down part of a BomboBox
is closed. OnDropDown just notify when the drop-down is displayed, not
when it is closed.

Is there a message in WndProc that can be used to intercept a drop-down
closing?

Listen for 'WM_COMMAND' of the parent window and check if 'wParam''s
high-order word is 'CBN_CLOSEUP'.

 

[Carlo]

Hello Herfried,
thank you for your help.

The problem is that I don't have a parent window available (do you means
parent form?) because I'm working on a control that inherits from
System.Windows.Forms.ComboBox.
I checked all messages raised by WndProc of my ComboBox, but I've seen any
WM_COMMAND.

Carlo

 

[Claes Bergefall]

Listen for 'WM_COMMAND' of the parent window and check if 'wParam''s
high-order word is 'CBN_CLOSEUP'.

--

No need to use the parent window. All WM_COMMAND and WM_NOTIFY
messages are reflected to the control itself. Use this:

http://groups.google.se/group/micro...ework.windowsforms/msg/579c8133581d8d1f?hl=sv


/claes

 

[Claes Bergefall]

No need to use the parent window. All WM_COMMAND and WM_NOTIFY
messages are reflected to the control itself. Use this:

http://groups.google.se/group/micro...ework.windowsforms/msg/579c8133581d8d1f?hl=sv


/claes

Just an addition. The above solution requires that you inherit the combobox
If you, for some reason, don't want to inherit it, use Herfried's suggestion
(the parent being the Form/Panel/whatever that the combobox is placed on)

/claes

 

[Carlo]

This is exactly what I was searching for!

Thank you to Herfried and thank you to Claes.

Carlo