How to custom control and how are a classic controll's methods created?

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Hi everyone,
I am newbie, who is learning how to custom controls.
So i want to ask everyone two questions, that's i really have no idea when I am checking an custom combobox:

-It's "FilterItemOnProperty" method i tried F12 on it in VS2010 but i don't see anywhere show how the code write out as we programed ( i am newbie so please forgive me).How is it defined?
-How do let classic combobox would not close its list when we type "a" or else?? or how to know that when would it closed or an event so that i can prevent it close?

I based on this custom combobox:A data-bound multi-column combobox[^]
I noticed when i type anything word, its item-list will not show up but close.
I tried but can't prevent it from closing when i type " abc" on combobox.
I really have no idea.
Please just give me a hint.
thank in advance.

Posted 24-Mar-15 4:47am

Tokisan

Updated 24-Mar-15 15:44pm

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Sergey Alexandrovich Kryukov 24-Mar-15 10:54am

Not clear. Would you explain it all in sufficient detail? Please use "Improve question".
What does it mean, "close a list"?
Could you show your control class code and some testing code sample?
—SA

BillWoodruff 24-Mar-15 14:54pm

I think part of your confusion is that you are studying an advanced custom control (one that derives from ComboBox) and is owner-drawn, and supports data-binding.

What do you think about starting with a simpler learning goal ?

Tokisan 24-Mar-15 19:57pm

Could u please give me where i should begin first? and could u please give me a hint about the my first question?

Richard MacCutchan 25-Mar-15 4:44am

A hint: Learn how to use your debugger to see what is happening in your code, and provide proper details of your problem. Remember, we cannot see what is happening on your screen, or guess what your code does. And, as already suggested, as a newbie, you would be better learning the basics before trying such an advanced concept.

Tokisan 25-Mar-15 8:57am

Thank alot. But the question of how the combobox close its item-list when typing somethings still run around my head. Anyway,i have nothing to show my gratidute to u. Thank again.

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