How do I create a dropdown window?

[Declan Brennan]

I'm interested in implementing a dropdown window within my
own custom control similar to what occurs with ComboBox
and DateTimePicker. Examples of this functionality exist
in IWindowsFormsEditorService.DropDownControl() or the
createPopup() method in IE. This window should have no
caption and be TopMost (both easy to achieve). More
difficult, the form performing the dropdown should retain
the activation even when clicks occur in the dropdown and
clicks anywhere on the form performing the dropdown (even
in non-client areas) should close the dropdown. If anybody
has a little code snipet that does this job, I'll be very
grateful.

Thanks,

Dec.

 

[Bob Powell [MVP]]

Try using the NativeWiindow class. I use this in my bubble tooltip control.

The help has a sample on using NativeWindow.

--
Bob Powell [MVP]
C#, System.Drawing

Check out the GDI+ FAQ
http://www.bobpowell.net/gdiplus_faq.htm

Buy quality Windows Forms tools
http://www.bobpowell.net/xray_tools.htm

New Tips and Tricks include creating transparent controls
and how to do double buffering.

 

[Bob Powell [MVP]]

Maybe if your dropdown captures the mouse and closes if the click is outside
it's area...

--
Bob Powell [MVP]
C#, System.Drawing

Check out the GDI+ FAQ
http://www.bobpowell.net/gdiplus_faq.htm

Buy quality Windows Forms tools
http://www.bobpowell.net/xray_tools.htm

New Tips and Tricks include creating transparent controls
and how to do double buffering.