There are no. of articles on CP, please have a look:
An article showing how to build a WPF autocomplete textbox control with delay input"
WPF Autocomplete Textbox Control[
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A custom control based on a TextBox which allows autocompletion based on a custom filter from any items source.:
A Reusable WPF Autocomplete TextBox[
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This article is about a control that can be used to auto-omplete folders that have been typed into a textbox. It shows just how versatile binding and theming in WPF really is:
AutoSuggest and AutoComplete control in WPF[
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This article demos how to create a textbox which can auto-suggest items at runtime based on input, in this case, disk drive folders:
WPF AutoComplete Folder TextBox[
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Some other sites for AutoComplete Control:
WPF AutoComplete TextBox Control[
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Intellibox - A WPF auto complete textbox search control[
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Here's another good link:
Click Here[
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Hope it helps!