Masked Combo Box

My requirement ins simple .. but I just dunno how to get this done. All I need is a Mask Combo Box. ie. I have a DropDownList (style) combo box. So I let users select from its list or type a value. But I want to restrict a few characters from getting typed.
I thought of having my MaskCombo class overriding PreTranslateMessage. I can trap the key and if it is one of the restricted chars I can return ZERO. But since I need only a few valid chars., I'd have to put in a whole lot of things to restrict. I dont want to do this.
Let me put this in simpler words. How do I restrict the user input to just Numbers, "-" and A to Z (Caps) ONLY !
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sri_darrAsked:
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migelConnect With a Mentor Commented:
Hi!
you need to subclass Edit control of the ComboBox
how to achieve this look at MSDN
"HOWTO: Subclass CListBox and CEdit Inside of CComboBox"
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Meir RivkinFull stack Software EngineerCommented:
migel: why can't he create CListBox derive class and manipulate the key down in windowProc?
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sri_darrAuthor Commented:
Thanks migel.... With that article and a li'l bit of trial codes I was able to acheive this. The right direction is what I needed. Thanks again.

PS: I searched on this "Subclass AND ComboBox" and I cant believe I missed this topic in that whole list.
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